Steven A. Cummer

Publications

  • Liu, L; Katko, AR; Li, D; Cummer, SA,
    Broadband electromagnetic metamaterials with reconfigurable fluid channels
    , Physical Review B: Condensed Matter and Materials Physics, vol 89 no. 24 (2014) [10.1103/PhysRevB.89.245132] [abs].
  • Katko, AR; Barrett, JP; Cummer, SA,
    Time-varying transistor-based metamaterial for tunability, mixing, and efficient phase conjugation
    , Journal of Applied Physics, vol 115 no. 14 (2014), pp. 144501-144501 [10.1063/1.4871195] [abs].
  • Zigoneanu, L; Popa, BI; Cummer, SA, Three-dimensional broadband omnidirectional acoustic ground cloak., Nature Materials, vol 13 no. 4 (2014), pp. 352-355 [10.1038/nmat3901] [abs].
  • Cummer, SA, Applied physics. Selecting the direction of sound transmission., Science, vol 343 no. 6170 (2014), pp. 495-496 [10.1126/science.1249616] [abs].
  • Yaniv, R; Yair, Y; Price, C; Bór, J; Sato, M; Hobara, Y; Cummer, S; Li, J; Devir, A, Ground-based observations of the relations between lightning charge-moment-change and the physical and optical properties of column sprites, Journal of Atmospheric and Solar - Terrestrial Physics, vol 107 (2014), pp. 60-67 [abs].
  • Zigoneanu, L; Popa, BI; Cummer, SA, Three-dimensional broadband omnidirectional acoustic ground cloak, Nature Materials, vol 13 no. 4 (2014), pp. 352-355 [10.1038/nmat3901] [abs].
  • Xie, Y; Konneker, A; Popa, B-I; Cummer, SA, Tapered labyrinthine acoustic metamaterials for broadband impedance matching, Applied Physics Letters, vol 103 no. 20 (2013) [10.1063/1.4831770] [abs].
  • Hawkes, AM; Katko, AR; Cummer, SA, A microwave metamaterial with integrated power harvesting functionality, Applied Physics Letters, vol 103 no. 16 (2013) [10.1063/1.4824473] [abs].
  • Lang, TJ; Cummer, SA; Rutledge, SA; Lyons, WA, The meteorology of negative cloud-to-ground lightning strokes with large charge moment changes: Implications for negative sprites, Journal of Geophysical Research. Atmospheres, vol 118 no. 14 (2013), pp. 7886-7896 [10.1002/jgrd.50595] [abs].
  • Popa, B-I; Zigoneanu, L; Cummer, SA, Tunable active acoustic metamaterials, Physical Review B: Condensed Matter and Materials Physics, vol 88 no. 2 (2013) [10.1103/PhysRevB.88.024303] [abs].
  • Lu, G; Cummer, SA; Li, J; Zigoneanu, L; Lyons, WA; Stanley, MA; Rison, W; Krehbiel, PR; Edens, HE; Thomas, RJ; Beasley, WH; Weiss, SA; Blakeslee, RJ; Bruning, EC; MacGorman, DR; Meyer, TC; Palivec, K; Ashcraft, T; Samaras, T, Coordinated observations of sprites and in-cloud lightning flash structure, Journal of Geophysical Research. Atmospheres, vol 118 no. 12 (2013), pp. 6607-6632 [10.1002/jgrd.50459] [abs].
  • Meyer, TC; Lang, TJ; Rutledge, SA; Lyons, WA; Cummer, SA; Lu, G; Lindsey, DT, Radar and lightning analyses of gigantic jet-producing storms, Journal of Geophysical Research. Atmospheres, vol 118 no. 7 (2013), pp. 2872-2888 [10.1002/jgrd.50302] [abs].
  • Katko, AR; Cummer, SA, Functional metamaterials for wireless phase conjugation, CLEO: QELS_Fundamental Science, CLEO:QELS FS 2013 (2013) [abs].
  • Marshall, T; Stolzenburg, M; Karunarathne, S; Cummer, S; Lu, G; Betz, HD; Briggs, M; Connaughton, V; Xiong, S, Initial breakdown pulses in intracloud lightning flashes and their relation to terrestrial gamma ray flashes, Journal of Geophysical Research, vol 118 no. 19 (2013), pp. 10907-10925 [10.1002/jgrd.50866] [abs].
  • Katko, AR; Cummer, SA, Functional metamaterials for wireless phase conjugation, 2013 Conference on Lasers and Electro-Optics, CLEO 2013 (2013) [abs].
  • Cummer, SA; Lyons, WA; Stanley, MA, Three years of lightning impulse charge moment change measurements in the United States, Journal of Geophysical Research, vol 118 no. 11 (2013), pp. 5176-5189 [10.1002/jgrd.50442] [abs].
  • Østgaard, N; Gjesteland, T; Carlson, BE; Collier, AB; Cummer, SA; Lu, G; Christian, HJ, Simultaneous observations of optical lightning and terrestrial gamma ray flash from space, Geophysical Research Letters, vol 40 no. 10 (2013), pp. 2423-2426 [10.1002/grl.50466] [abs].
  • Dwyer, JR; Cummer, SA, Radio emissions from terrestrial gamma-ray flashes, Journal of Geophysical Research, vol 118 no. 6 (2013), pp. 3769-3790 [10.1002/jgra.50188] [abs].
  • Zigoneanu, L; Popa, B-I; Cummer, SA; ASME, , SOUND MANIPULATION WITH ACOUSTIC METAMATERIALS, PROCEEDINGS OF THE ASME NOISE CONTROL AND ACOUSTICS DIVISION CONFERENCE (NCAD 2012) (2013), pp. 521-528 [abs].
  • Qin, J; Celestin, S; Pasko, VP; Cummer, SA; McHarg, MG; Stenbaek-Nielsen, HC, Mechanism of column and carrot sprites derived from optical and radio observations, Geophysical Research Letters, vol 40 no. 17 (2013), pp. 4777-4782 [abs].
  • Xie, Y; Popa, BI; Zigoneanu, L; Cummer, SA, Measurements of Broadband Negative Index in Space-Coiling Acoustic
    Metamaterials
    (2012) [abs].
  • Li, D; Zigoneanu, L; Popa, BI; Cummer, SA, Design of an acoustic metamaterial lens using genetic algorithms., Journal of the Acoustical Society of America, vol 132 no. 4 (2012), pp. 2823-2833 [10.1121/1.4744942] [abs].
  • Dwyer, JR; Smith, DM; Cummer, SA, High-energy atmospheric physics: Terrestrial gamma-ray flashes and related phenomena, Space Science Reviews, vol 173 no. 1-4 (2012), pp. 133-196 [10.1007/s11214-012-9894-0] [abs].
  • Katko, AR; Shvets, G; Cummer, SA, Phase conjugation metamaterials: Particle design and imaging experiments, Journal of Optics A: Pure and Applied Optics, vol 14 no. 11 (2012) [10.1088/2040-8978/14/11/114003] [abs].
  • Hager, WW; Sonnenfeld, RG; Feng, W; Kanmae, T; Stenbaek-Nielsen, HC; McHarg, MG; Haaland, RK; Cummer, SA; Lu, G; Lapierre, JL, Charge rearrangement by sprites over a north Texas mesoscale convective system, Journal of Geophysical Research, vol 117 no. 22 (2012) [10.1029/2012JD018309] [abs].
  • Popa, BI; Cummer, SA, Nonreciprocal active metamaterials, Physical Review B: Condensed Matter and Materials Physics, vol 85 no. 20 (2012) [10.1103/PhysRevB.85.205101] [abs].
  • Li, J; Cummer, S; Lu, G; Zigoneanu, L, Charge moment change and lightning-driven electric fields associated with negative sprites and halos, Journal of Geophysical Research, vol 117 no. 9 (2012) [10.1029/2012JA017731] [abs].
  • Haddad, MA; Rakov, VA; Cummer, SA, New measurements of lightning electric fields in Florida: Waveform characteristics, interaction with the ionosphere, and peak current estimates, Journal of Geophysical Research, vol 117 no. 10 (2012) [10.1029/2011JD017196] [abs].
  • Li, J; Cummer, S, Relationship between sprite streamer behavior and lightning-driven electric fields, Journal of Geophysical Research, vol 117 no. 1 (2012) [10.1029/2011JA016843] [abs].
  • Lu, G; Cummer, SA; Blakeslee, RJ; Weiss, S; Beasley, WH, Lightning morphology and impulse charge moment change of high peak current negative strokes, Journal of Geophysical Research, vol 117 no. 4 (2012) [10.1029/2011JD016890] [abs].
  • Thompson, RT; Cummer, SA, Transformation optics, Advances in Imaging and Electron Physics, vol 171 (2012), pp. 195-295 [10.1016/B978-0-12-394297-5.00005-2] [abs].
  • Barrett, JP; Cummer, SA, Active nonlinear metamaterials loaded with negative differential resistance elements and circuits, Proceedings of SPIE - The International Society for Optical Engineering, vol 8455 (2012) [10.1117/12.928991] [abs].
  • Katko, AR; Hawkes, AM; Cummer, SA, Nonlinear and active RF metamaterial applications using embedded devices, Proceedings of SPIE - The International Society for Optical Engineering, vol 8455 (2012) [10.1117/12.928987] [abs].
  • Zigoneanu, L; Popa, B-I; Cummer, SA, Sound manipulation with acoustic metamaterials, 41st International Congress and Exposition on Noise Control Engineering 2012, INTER-NOISE 2012, vol 2 (2012), pp. 1555-1562 [abs].
  • Popa, BI; Zigoneanu, L; Cummer, SA, Experimental acoustic ground cloak in air., Physical Review Letters, vol 106 no. 25 (2011) [abs].
  • Popa, BI; Cummer, SA, Homogeneous and compact acoustic ground cloaks, Physical Review B: Condensed Matter and Materials Physics, vol 83 no. 22 (2011) [10.1103/PhysRevB.83.224304] [abs].
  • Popa, BI; Cummer, SA, Complex coordinates in transformation optics, Physical Review A: Atomic, Molecular and Optical Physics, vol 84 no. 6 (2011) [10.1103/PhysRevA.84.063837] [abs].
  • Zigoneanu, L; Popa, BI; Cummer, SA, Design and measurements of a broadband two-dimensional acoustic lens, Physical Review B: Condensed Matter and Materials Physics, vol 84 no. 2 (2011) [10.1103/PhysRevB.84.024305] [abs].
  • Thompson, RT; Cummer, SA; Frauendiener, J, Generalized transformation optics of linear materials, Journal of Optics A: Pure and Applied Optics, vol 13 no. 5 (2011) [10.1088/2040-8978/13/5/055105] [abs].
  • Zigoneanu, L; Popa, BI; Starr, AF; Cummer, SA, Design and measurements of a broadband two-dimensional acoustic metamaterial with anisotropic effective mass density, Journal of Applied Physics, vol 109 no. 5 (2011) [10.1063/1.3552990] [abs].
  • Cummer, SA; Thompson, RT, Frequency conversion by exploiting time in transformation optics, Journal of Optics A: Pure and Applied Optics, vol 13 no. 2 (2011) [10.1088/2040-8978/13/2/024007] [abs].
  • Katko, AR; Hawkes, AM; Barrett, JP; Cummer, SA, RF limiter metamaterial using p-i-n diodes, IEEE Antennas and Wireless Propagation Letters, vol 10 (2011), pp. 1571-1574 [10.1109/LAWP.2011.2182490] [abs].
  • Thompson, RT; Cummer, SA; Frauendiener, J, A completely covariant approach to transformation optics, Journal of Optics A: Pure and Applied Optics, vol 13 no. 2 (2011) [10.1088/2040-8978/13/2/024008] [abs].
  • Neubert, T; Chanrion, O; Arnone, E; Zanotti, F; Cummer, S; Li, J; Füllekrug, M; Soula, S; Velde, OVD, The properties of a gigantic jet reflected in a simultaneous sprite: Observations interpreted by a model, Journal of Geophysical Research, vol 116 no. 12 (2011) [10.1029/2011JA016928] [abs].
  • Zhai, Y; Cummer, SA; Green, JL; Reinisch, BW; Kaiser, ML; Reiner, MJ; Goetz, K, Magnetospheric radio tomographic imaging with IMAGE and Wind, Journal of Geophysical Research, vol 116 no. 12 (2011) [10.1029/2011JA016743] [abs].
  • Cummer, SA; Lu, G; Li, J; Blakeslee, RJ; Smith, DM; Dwyer, JR; Briggs, MS; Connaughton, V; Fishman, GJ, Detailed observations of lightning flashes and processes associated with terrestrial gamma ray flashes, 2011 30th URSI General Assembly and Scientific Symposium, URSIGASS 2011 (2011) [10.1109/URSIGASS.2011.6050934] [abs].
  • Cummer, SA; Popa, BI; Katko, A, Powered and active RF metamaterials, 2011 30th URSI General Assembly and Scientific Symposium, URSIGASS 2011 (2011) [10.1109/URSIGASS.2011.6050640] [abs].
  • Smith, DM; Dwyer, JR; Hazelton, BJ; Grefenstette, BW; Martinez-Mckinney, GFM; Zhang, ZY; Lowell, AW; Kelley, NA; Splitt, ME; Lazarus, SM; Ulrich, W; Schaal, M; Saleh, ZH; Cramer, E; Rassoul, H; Cummer, SA; Lu, G; Shao, XM; Ho, C; Hamlin, T; Blakeslee, RJ; Heckman, S, A terrestrial gamma ray flash observed from an aircraft, Journal of Geophysical Research, vol 116 no. 20 (2011) [10.1029/2011JD016252] [abs].
  • Cummer, SA; Lu, G; Li, J; Lyons, WA; Beasley, WH; MacGorman, DR; Krehbiel, PR; Rison, W; Cohen, MB; Velde, OVD; Lang, TJ; Rutledge, SA, Observations of lightning flash development associated with gigantic jets, 2011 30th URSI General Assembly and Scientific Symposium, URSIGASS 2011 (2011) [10.1109/URSIGASS.2011.6050942] [abs].
  • Lang, TJ; Li, J; Lyons, WA; Cummer, SA; Rutledge, SA; MacGorman, DR, Transient luminous events above two mesoscale convective systems: Charge moment change analysis, Journal of Geophysical Research, vol 116 no. 10 (2011) [10.1029/2011JA016758] [abs].
  • Katko, AR; Popa, BI; Barrett, JP; Hawkes, AM; Cummer, SA, Powered and nonlinear RF metamaterials, Proceedings of SPIE - The International Society for Optical Engineering, vol 8093 (2011) [10.1117/12.894657] [abs].
  • Lu, G; Cummer, SA; Lyons, WA; Krehbiel, PR; Li, J; Rison, W; Thomas, RJ; Edens, HE; Stanley, MA; Beasley, W; MacGorman, DR; Velde, OAVD; Cohen, MB; Lang, TJ; Rutledge, SA, Lightning development associated with two negative gigantic jets, Geophysical Research Letters, vol 38 no. 12 (2011) [10.1029/2011GL047662] [abs].
  • Cummer, SA; Lu, G; Briggs, MS; Connaughton, V; Xiong, S; Fishman, GJ; Dwyer, JR, The lightning-TGF relationship on microsecond timescales, Geophysical Research Letters, vol 38 no. 14 (2011) [10.1029/2011GL048099] [abs].
  • Han, F; Cummer, SA; Li, J; Lu, G, Daytime ionospheric D region sharpness derived from VLF radio atmospherics, Journal of Geophysical Research, vol 116 no. 5 (2011) [10.1029/2010JA016299] [abs].
  • Smith, DM; Dwyer, JR; Hazelton, BJ; Grefenstette, BW; Martinez-Mckinney, GFM; Zhang, ZY; Lowell, AW; Kelley, NA; Splitt, ME; Lazarus, SM; Ulrich, W; Schaal, M; Saleh, ZH; Cramer, E; Rassoul, HK; Cummer, SA; Lu, G; Blakeslee, RJ, The rarity of terrestrial gamma-ray flashes, Geophysical Research Letters, vol 38 no. 8 (2011) [10.1029/2011GL046875] [abs].
  • Li, J; Cummer, S, Estimation of electric charge in sprites from optical and radio observations, Journal of Geophysical Research, vol 116 no. 1 (2011) [10.1029/2010JA015391] [abs].
  • Gamerota, WR; Cummer, SA; Li, J; Stenbaek-Nielsen, HC; Haaland, RK; McHarg, MG, Comparison of sprite initiation altitudes between observations and models, Journal of Geophysical Research, vol 116 no. 2 (2011) [10.1029/2010JA016095] [abs].
  • Lu, G; Cummer, SA; Li, J; Han, F; Smith, DM; Grefenstette, BW, Characteristics of broadband lightning emissions associated with terrestrial gamma ray flashes, Journal of Geophysical Research, vol 116 no. 3 (2011) [10.1029/2010JA016141] [abs].
  • Katko, AR; Gu, S; Barrett, JP; Popa, BI; Shvets, G; Cummer, SA, Phase conjugation and negative refraction using nonlinear active metamaterials., Physical Review Letters, vol 105 no. 12 (2010) [abs].
  • Ybarra, GA; Collins, LM; Huettel, LG; Coonley, KD; Massoud, HZ; Board, JA; Cummer, SA; Choudhury, RR; Gustafson, MR; Jokerst, NM; Brooke, MA; Willett, RM; Kim, J; Absher, MS, Integrated sensing and information processing theme-based redesign of the undergraduate electrical and computer engineering curriculum at Duke University, Advances in Engineering Education, vol 2 no. 4 (2010) [abs].
  • Popa, BI; Cummer, SA, Design of layered transformation-optics devices of arbitrary shape, Physical Review A: Atomic, Molecular and Optical Physics, vol 82 no. 3 (2010) [10.1103/PhysRevA.82.033837] [abs].
  • Gu, S; Barrett, JP; Hand, TH; Popa, BI; Cummer, SA, A broadband low-reflection metamaterial absorber, Journal of Applied Physics, vol 108 no. 6 (2010) [10.1063/1.3485808] [abs].
  • Sajuyigbe, S; Ross, M; Geren, P; Cummer, SA; Tanielian, MH; Smith, DR, Wide angle impedance matching metamaterials for waveguide-fed phased-array antennas, IET Microwaves, Antennas and Propagation, vol 4 no. 8 (2010), pp. 1063-1072 [10.1049/iet-map.2009.0543] [abs].
  • Lu, G; Blakeslee, RJ; Li, J; Smith, DM; Shao, XM; McCaul, EW; Buechler, DE; Christian, HJ; Hall, JM; Cummer, SA, Lightning mapping observation of a terrestrial gamma-ray flash, Geophysical Research Letters, vol 37 no. 11 (2010) [10.1029/2010GL043494] [abs].
  • Inan, US; Cummer, SA; Marshall, RA, A survey of ELF and VLF research on lightning-ionosphere interactions and causative discharges, Journal of Geophysical Research, vol 115 no. 6 (2010) [10.1029/2009JA014775] [abs].
  • Lang, TJ; Lyons, WA; Rutledge, SA; Meyer, JD; MacGorman, DR; Cummer, SA, Transient luminous events above two mesoscale convective systems: Storm structure and evolution, Journal of Geophysical Research, vol 115 no. 5 (2010) [abs].
  • Cummer, SA, Transformation acoustics, 17th International Congress on Sound and Vibration 2010, ICSV 2010, vol 1 (2010), pp. 197-202 [abs].
  • Rodger, CJ; Carson, BR; Cummer, SA; Gamble, RJ; Clilverd, MA; Green, JC; Sauvaud, JA; Parrot, M; Berthelier, JJ, Contrasting the efficiency of radiation belt losses caused by ducted and nonducted whistler-mode waves from ground-based transmitters, Journal of Geophysical Research, vol 115 no. 12 (2010) [10.1029/2010JA015880] [abs].
  • Velde, OAVD; Bór, J; Li, J; Cummer, SA; Arnone, E; Zanotti, F; Füllekrug, M; Haldoupis, C; Naitamor, S; Farges, T, Multi-instrumental observations of a positive gigantic jet produced by a winter thunderstorm in Europe, Journal of Geophysical Research, vol 115 no. 24 (2010) [10.1029/2010JD014442] [abs].
  • Sabbas, FTS; Taylor, MJ; Pautet, PD; Bailey, M; Cummer, S; Azambuja, RR; Santiago, JPC; Thomas, JN; Pinto, O; Solorzano, NN; Schuch, NJ; Freitas, SR; Ferreira, NJ; Conforte, JC, Observations of prolific transient luminous event production above a mesoscale convective system in Argentina during the Sprite2006 Campaign in Brazil, Journal of Geophysical Research, vol 115 no. 11 (2010) [10.1029/2009JA014857] [abs].
  • Han, F; Cummer, SA, Midlatitude daytime D region ionosphere variations measured from radio atmospherics, Journal of Geophysical Research, vol 115 no. 10 (2010) [10.1029/2010JA015715] [abs].
  • Han, F; Cummer, SA, Midlatitude nighttime D region ionosphere variability on hourly to monthly time scales, Journal of Geophysical Research, vol 115 no. 9 (2010) [10.1029/2010JA015437] [abs].
  • Popa, BL; Cummer, SA, Theory and design of practical metamaterials for acoustic cloaking, ASME International Mechanical Engineering Congress and Exposition, Proceedings, vol 15 (2010), pp. 113-114 [10.1115/IMECE2009-11254] [abs].
  • Cohen, MB; Inan, US; Said, RK; Briggs, MS; Fishman, GJ; Connaughton, V; Cummer, SA, A lightning discharge producing a beam of relativistic electrons into space, Geophysical Research Letters, vol 37 no. 18 (2010) [10.1029/2010GL044481] [abs].
  • Hand, TH; Cummer, SA, Reconfigurable reflectarray using addressable metamaterials, IEEE Antennas and Wireless Propagation Letters, vol 9 (2010), pp. 70-74 [10.1109/LAWP.2010.2043211] [abs].
  • Williams, ER; Lyons, WA; Hobara, Y; Mushtak, VC; Asencio, N; Boldi, R; Bór, J; Cummer, SA; Greenberg, E; Hayakaw, M; Holzworth, RH; Kotroni, V; Li, J; Morales, C; Nelson, TE; Price, C; Russell, B; Sato, M; Sátori, G; Shirahata, K; Takahashio, Y; Yamashitao, K, Ground-based detection of sprites and their parent lightning flashes over Africa during the 2006 AMMA campaign, Quarterly Journal of Royal Meteorological Society, vol 136 no. SUPPL. 1 (2010), pp. 257-271 [10.1002/qj.489] [abs].
  • Yuan, Y; Popa, BI; Cummer, SA, Zero loss magnetic metamaterials using powered active unit cells., Optics Express, vol 17 no. 18 (2009), pp. 16135-16143 [abs].
  • Zhai, Y; Cummer, SA, Fast tomographic reconstruction strategy for diffuse optical tomography., Optics Express, vol 17 no. 7 (2009), pp. 5285-5297 [abs].
  • Lyons, WA; Stanley, MA; Meyer, JD; Nelson, TE; Rutledge, SA; Lang, TL; Cummer, SA, The meteorological and electrical structure of TLE-producing convective storms, Lightning: Principles, Instruments and Applications: Review of Modern Lightning Research (2009), pp. 387-415 [abs].
  • Cummer, SA; Kundtz, N; Popa, BI, Electromagnetic surface and line sources under coordinate transformations, Physical Review A: Atomic, Molecular and Optical Physics, vol 80 no. 3 (2009) [10.1103/PhysRevA.80.033820] [abs].
  • Allen, J; Kundtz, N; Roberts, DA; Cummer, SA; Smith, DR, Electromagnetic source transformations using superellipse equations, Applied Physics Letters, vol 94 no. 19 (2009) [10.1063/1.3130182] [abs].
  • Popa, BI; Cummer, SA, Design and characterization of broadband acoustic composite metamaterials, Physical Review B: Condensed Matter and Materials Physics, vol 80 no. 17 (2009) [10.1103/PhysRevB.80.174303] [abs].
  • Li, J; Cummer, SA, Measurement of sprite streamer acceleration and deceleration, Geophysical Research Letters, vol 36 no. 10 (2009) [10.1029/2009GL037581] [abs].
  • Cummer, SA; Li, J; Han, F; Lu, G; Jaugey, N; Lyons, WA; Nelson, TE, Quantification of the troposphere-to-ionosphere charge transfer in a gigantic jet, Nature Geoscience, vol 2 no. 9 (2009), pp. 617-620 [10.1038/ngeo607] [abs].
  • Kuo, CL; Chou, JK; Tsai, LY; Chen, AB; Su, HT; Hsu, RR; Cummer, SA; Frey, HU; Mende, SB; Takahashi, Y; Lee, LC, Discharge processes, electric field, and electron energy in ISUAL recorded gigantic jets, Journal of Geophysical Research, vol 114 no. 4 (2009) [10.1029/2008JA013791] [abs].
  • Hazelton, BJ; Grefenstette, BW; Smith, DM; Dwyer, JR; Shao, XM; Cummer, SA; Chronis, T; Lay, EH; Holzworth, RH, Spectral dependence of terrestrial gamma-ray flashes on source distance, Geophysical Research Letters, vol 36 no. 1 (2009) [10.1029/2008GL035906] [abs].
  • Popa, BI; Cummer, SA, Cloaking with optimized homogeneous anisotropic layers, Physical Review A: Atomic, Molecular and Optical Physics, vol 79 no. 2 (2009) [10.1103/PhysRevA.79.023806] [abs].
  • Adachi, T; Cummer, SA; Li, J; Takahashi, Y; Hsu, RR; Su, HT; Chen, AB; Mende, SB; Frey, HU, Estimating lightning current moment waveforms from satellite optical measurements, Geophysical Research Letters, vol 36 no. 18 (2009) [10.1029/2009GL039911] [abs].
  • Hand, TH; Cummer, SA, Controllable magnetic metamaterial using digitally addressable split-ring resonators, IEEE Antennas and Wireless Propagation Letters, vol 8 (2009), pp. 262-265 [10.1109/LAWP.2009.2012879] [abs].
  • Hand, TH; Cummer, SA, A dynamic frequency selective surface using addressable metamaterials, International Symposium on Antennas and Propagation (APSURSI) (2009) [10.1109/APS.2009.5171934] [abs].
  • Cummer, SA, Electromagnetic source transformations and applications, International Symposium on Antennas and Propagation (APSURSI) (2009) [10.1109/APS.2009.5172321] [abs].
  • Sajuyigbe, S; Cummer, SA; Smith, DR, Utilization of metamaterials for wide angle impedance matching (WAIM) in phased array antennas, International Symposium on Antennas and Propagation (APSURSI) (2009) [10.1109/APS.2009.5172272] [abs].
  • Farrell, WM; Plaut, JJ; Cummer, SA; Gurnett, DA; Picardi, G; Watters, TR; Safaeinili, A, Is the Martian water table hidden from radar view?, Geophysical Research Letters, vol 36 no. 15 (2009) [10.1029/2009GL038945] [abs].
  • Popa, BI; Allen, J; Cummer, SA, Conformal array design with transformation electromagnetics, Applied Physics Letters, vol 94 no. 24 (2009) [10.1063/1.3158614] [abs].
  • Lu, G; Cummer, SA; Li, J; Han, F; Blakeslee, RJ; Christian, HJ, Charge transfer and in-cloud structure of large-charge-moment positive lightning strokes in a mesoscale convective system, Geophysical Research Letters, vol 36 no. 15 (2009) [10.1029/2009GL038880] [abs].
  • Cummer, SA; Liu, R; Cui, TJ, A rigorous and nonsingular two dimensional cloaking coordinate transformation, Journal of Applied Physics, vol 105 no. 5 (2009) [10.1063/1.3080155] [abs].
  • Kundtz, N; Roberts, DA; Allen, J; Cummer, S; Smith, DR, Optical source transformations., Optics Express, vol 16 no. 26 (2008), pp. 21215-21222 [abs].
  • Yuan, Y; Bingham, C; Tyler, T; Palit, S; Hand, TH; Padilla, WJ; Smith, DR; Jokerst, NM; Cummer, SA, Dual-band planar electric metamaterial in the terahertz regime., Optics Express, vol 16 no. 13 (2008), pp. 9746-9752 [abs].
  • Popa, BI; Cummer, SA, Compact dielectric particles as a building block for low-loss magnetic metamaterials., Physical Review Letters, vol 100 no. 20 (2008) [abs].
  • Rahm, M; Cummer, SA; Schurig, D; Pendry, JB; Smith, DR, Optical design of reflectionless complex media by finite embedded coordinate transformations., Physical Review Letters, vol 100 no. 6 (2008) [abs].
  • Liu, R; Cheng, Q; Hand, T; Mock, JJ; Cui, TJ; Cummer, SA; Smith, DR, Experimental demonstration of electromagnetic tunneling through an epsilon-near-zero metamaterial at microwave frequencies., Physical Review Letters, vol 100 no. 2 (2008) [abs].
  • Cummer, SA; Popa, BI; Schurig, D; Smith, DR; Pendry, J; Rahm, M; Starr, A, Scattering theory derivation of a 3D acoustic cloaking shell., Physical Review Letters, vol 100 no. 2 (2008) [abs].
  • Liu, R; Cheng, Q; Hand, T; Mock, JJ; Cui, TJ; Cummer, SA; Smith, DR, Experimental demonstration of electromagnetic tunneling through an epsilon-near-zero metamaterial at microwave frequencies, Physical Review Letters, vol 1 no. 2 (2008) [abs].
  • Cummer, SA; Popa, BI; Schurig, D; Smith, DR; Pendry, J; Rahm, M; Starr, A, Scattering theory derivation of a 3D acoustic cloaking shell, Physical Review Letters, vol 1 no. 2 (2008) [abs].
  • Hand, TH; Yuan, Y; Palit, S; Bingham, C; Rahm, M; Smith, DR; Padilla, WJ; Jokerst, N; Cummer, SA, Dual-band planar electric THz metamaterial with resonator yield analysis (2008) [abs].
  • Hand, TH; Yuan, Y; Palit, S; Bingham, C; Rahm, M; Smith, DR; Padilla, WJ; Jokerst, N; Cummer, SA, Dual-band planar electric THz metamaterial with resonator yield analysis (2008) [abs].
  • Erentok, A; Ziolkowski, RW; Nielsen, JA; Greegor, RB; Parazzoli, CG; Tanielian, MH; Cummer, SA; Popa, BI; Hand, T; Vier, DC; Schultz, S, Lumped element-based, highly sub-wavelength, negative index metamaterials at UHF frequencies, Journal of Applied Physics, vol 104 no. 3 (2008) [10.1063/1.2959377] [abs].
  • Hand, TH; Cummer, SA, Frequency tunable electromagnetic metamaterial using ferroelectric loaded split rings, Journal of Applied Physics, vol 103 no. 6 (2008) [10.1063/1.2898575] [abs].
  • Taylor, MJ; Bailey, MA; Pautet, PD; Cummer, SA; Jaugey, N; Thomas, JN; Solorzano, NN; Sabbas, FS; Holzworth, RH; Pinto, O; Schuch, NJ, Rare measurements of a sprite with halo event driven by a negative lightning discharge over Argentina, Geophysical Research Letters, vol 35 no. 14 (2008) [10.1029/2008GL033984] [abs].
  • Rahm, M; Schurig, D; Roberts, DA; Cummer, SA; Smith, DR; Pendry, JB, Design of electromagnetic cloaks and concentrators using form-invariant coordinate transformations of Maxwell's equations, Photonics and Nanostructures: fundamentals and applications, vol 6 no. 1 (2008), pp. 87-95 [10.1016/j.photonics.2007.07.013] [abs].
  • Li, J; Cummer, SA; Lyons, WA; Nelson, TE, Coordinated analysis of delayed sprites with high-speed images and remote electromagnetic fields, Journal of Geophysical Research, vol 113 no. 20 (2008) [10.1029/2008JD010008] [abs].
  • Cummer, SA; Rahm, M; Schurig, D, Material parameters and vector scaling in transformation acoustics, New Journal of Physics, vol 10 (2008) [10.1088/1367-2630/10/11/115025] [abs].
  • Lyons, WA; Cummer, SA; Stanley, MA; Huffines, GR; Wiens, KC; Nelson, TE, Supercelles and sprites, Bulletin of the American Meteorological Society, vol 89 no. 8 (2008), pp. 1165-1174 [10.1175/2008BAMS2439.1] [abs].
  • Ross, M; Cummer, SA; Nielsen, TK; Zhang, Y, Simultaneous remote electric and magnetic field measurements of lightning continuing currents, Journal of Geophysical Research, vol 113 no. 20 (2008) [10.1029/2008JD010294] [abs].
  • Farrell, WM; Clifford, SM; Milkovich, SM; Plaut, JJ; Leuschen, CJ; Picardi, G; Gurnett, DA; Watters, TR; Safaeinili, A; Ivanov, AB; Phillips, RJ; Stofan, ER; Heggy, E; Cummer, SA; Espley, JR, MARSIS subsurface radar investigations of the South Polar reentrant Chasma Australe, Journal of Geophysical Research, vol 113 no. 4 (2008) [10.1029/2007JE002974] [abs].
  • Hand, TH; Gollub, J; Sajuyigbe, S; Smith, DR; Cummer, SA, Characterization of complementary electric field coupled resonant surfaces, Applied Physics Letters, vol 93 no. 21 (2008) [10.1063/1.3037215] [abs].
  • Yuan, Y; Bingham, C; Tyler, T; Palit, S; Hand, TH; Padilla, WJ; Jokerst, NM; Cummer, SA, A dual-resonant terahertz metamaterial based on single-particle electric-field-coupled resonators, Applied Physics Letters, vol 93 no. 19 (2008) [10.1063/1.3026171] [abs].
  • Hand, TH; Yu, Y; Palit, S; Bingham, C; Rahm, M; Smith, DR; Padilla, WJ; Jokerst, N; Cummer, SA, Dual-band planar electric THz metamaterial with resonator yield analysis, 2008 Conference on Quantum Electronics and Laser Science Conference on Lasers and Electro-Optics, CLEO/QELS (2008) [10.1109/CLEO.2008.4552339] [abs].
  • Lyons, WA; Cummer, SA; Stanley, MA; Huffines, GR; Wiens, KC; Nelson, TE, Supercells and sprites, Journal of Atmospheric and Oceanic Technology, vol 89 no. 8 (2008), pp. 1165-1174 [10.1175/2008BAMS2439.1] [abs].
  • Hand, TH; Yuan, Y; Palit, S; Bingham, C; Rahm, M; Smith, DR; Padilla, WJ; Jokerst, N; Cummer, SA, Dual-band planar electric THz metamaterial with resonator yield analysis, Conference on Quantum Electronics and Laser Science (QELS) - Technical Digest Series (2008) [10.1109/QELS.2008.4552848] [abs].
  • Cummer, SA; Popa, BI; Hand, TH, Q-based design equations and loss limits for resonant metamaterials and experimental validation, IEEE Transactions on Antennas and Propagation, vol 56 no. 1 (2008), pp. 127-132 [10.1109/TAP.2007.912959] [abs].
  • Kuo, C-L; Chen, AB; Lee, YJ; Tsai, LY; Chou, RK; Hsu, RR; Su, HT; Lee, LC; Cummer, SA; Frey, HU; Mende, SB; Takahashi, Y; Fukunishi, H, Modeling elves observed by FORMOSAT-2 satellite, Journal of Geophysical Research, vol 112 no. A11 (2007) [10.1029/2007JA012407] [abs].
  • Rahm, M; Cummer, SA; Schurig, D; Pendry, JB; Smith, DR, Optical design of reflectionless complex media by finite embedded
    coordinate transformations
    , Phys. Rev. Lett., vol 100 (2007) [10.1103/PhysRevLett.100.063903] [abs].
  • Cummer, SA; Schurig, D, One path to acoustic cloaking, New Journal of Physics, vol 9 (2007) [10.1088/1367-2630/9/3/045] [abs].
  • Gollub, J; Hand, T; Sajuyigbe, S; Mendonca, S; Cummer, S; Smith, DR, Characterizing the effects of disorder in metamaterial structures, Applied Physics Letters, vol 91 no. 16 (2007) [10.1063/1.2801391] [abs].
  • Hand, T; Cummer, S, Characterization of tunable metamaterial elements using MEMS switches, IEEE Antennas and Wireless Propagation Letters, vol 6 (2007), pp. 401-404 [10.1109/LAWP.2007.902807] [abs].
  • Kuo, CL; Chen, AB; Lee, YJ; Tsai, LY; Chou, RK; Hsu, RR; Su, HT; Lee, LC; Cummer, SA; Frey, HU; Mende, SB; Takahashi, Y; Fukunishi, H, Modeling elves observed by FORMOSAT-2 satellite, Journal of Geophysical Research, vol 112 no. 11 (2007) [10.1029/2007JA012407] [abs].
  • Velde, OAVD; Lyons, WA; Nelson, TE; Cummer, SA; Li, J; Bunnell, J, Analysis of the first gigantic jet recorded over continental North America, Journal of Geophysical Research, vol 112 no. 20 (2007) [10.1029/2007JD008575] [abs].
  • Popa, BI; Cummer, SA, An architecture for active metamaterial particles and experimental validation at RF, Microwave and Optical Technology Letters, vol 49 no. 10 (2007), pp. 2574-2577 [10.1002/mop.22789] [abs].
  • Hu, W; Cummer, SA; Lyons, WA, Testing sprite initiation theory using lightning measurements and modeled electromagnetic fields, Journal of Geophysical Research, vol 112 no. 13 (2007) [10.1029/2006JD007939] [abs].
  • Cheng, Z; Cummer, SA; Su, HT; Hsu, RR, Broadband very low frequency measurement of D region ionospheric perturbations caused by lightning electromagnetic pulses, Journal of Geophysical Research, vol 112 no. 6 (2007) [10.1029/2006JA011840] [abs].
  • Frey, HU; Mende, SB; Cummer, SA; Li, J; Adachi, T; Fukunishi, H; Takahashi, Y; Chen, AB; Hsu, RR; Su, HT; Chang, YS, Halos generated by negative cloud-to-ground lightning, Geophysical Research Letters, vol 34 no. 18 (2007) [10.1029/2007GL030908] [abs].
  • Hand, T; Cummer, SA; Engheta, N, The measured electric field spatial distribution within a metamaterial subwavelength cavity resonator, IEEE Transactions on Antennas and Propagation, vol 55 no. 6 II (2007), pp. 1781-1788 [10.1109/TAP.2007.898630] [abs].
  • Thomas, JN; Taylor, MJ; Pautet, D; Bailey, M; Solorzano, NN; Holzworth, RH; McCarthy, MP; Kokorowski, M; Sabbas, FS; Jr, OP; Cummer, SA; Jaugey, N; Li, J; Schuch, NJ, A very active sprite-producing storm observed over Argentina, Eos, vol 88 no. 10 (2007) [abs].
  • Parazzoli, CG; Greegor, RB; Tanielian, MH; Smith, DR; Cummer, S; Schurig, D; Ziolkowski, R, Applications of metamaterials in the GHz frequency domain, International Symposium on Antennas and Propagation (APSURSI) (2007), pp. 1152-1155 [10.1109/APS.2007.4395703] [abs].
  • Erentok, A; Ziolkowski, RW; Nielsen, JA; Greegor, RB; Parazzoli, CG; Tanielian, MH; Cummer, SA; Popa, BI; Hand, T; Vier, DC; Schultz, S, Low frequency lumped element-based negative index metamaterial, Applied Physics Letters, vol 91 no. 18 (2007) [10.1063/1.2803771] [abs].
  • Popa, BI; Cummer, SA, Design and experimental demonstration of active RF metamaterials, International Symposium on Antennas and Propagation (APSURSI) (2007), pp. 2546-2549 [10.1109/APS.2007.4396053] [abs].
  • Schurig, D; Mock, JJ; Justice, BJ; Cummer, SA; Pendry, JB; Starr, AF; Smith, DR, Metamaterial electromagnetic cloak at microwave frequencies., Science, vol 314 no. 5801 (2006), pp. 977-980 [10.1126/science.1133628] [abs].
  • Atreya, SK; Wong, AS; Renno, NO; Farrell, WM; Delory, GT; Sentman, DD; Cummer, SA; Marshall, JR; Rafkin, SC; Catling, DC, Oxidant enhancement in martian dust devils and storms: implications for life and habitability., Astrobiology, vol 6 no. 3 (2006), pp. 439-450 [10.1089/ast.2006.6.439] [abs].
  • Delory, GT; Farrell, WM; Atreya, SK; Renno, NO; Wong, AS; Cummer, SA; Sentman, DD; Marshall, JR; Rafkin, SC; Catling, DC, Oxidant enhancement in martian dust devils and storms: storm electric fields and electron dissociative attachment., Astrobiology, vol 6 no. 3 (2006), pp. 451-462 [10.1089/ast.2006.6.451] [abs].
  • Zhai, Y; Cummer, SA, An orthogonal projection and regularization technique for magnetospheric radio tomography, Journal of Geophysical Research, vol 111 no. 3 (2006) [10.1029/2005JA011039] [abs].
  • Hu, W; Cummer, SA, An FDTD model for low and high altitude lightning-generated EM fields, IEEE Transactions on Antennas and Propagation, vol 54 no. 5 (2006), pp. 1513-1522 [10.1109/TAP.2006.874336] [abs].
  • Cheng, Z; Cummer, SA; Baker, DN; Kanekal, SG, Nighttime D region electron density profiles and variabilities inferred from broadband measurements using VLF radio emissions from lightning, Journal of Geophysical Research, vol 111 no. 5 (2006) [10.1029/2005JA011308] [abs].
  • Cummer, SA; Frey, HU; Mende, SB; Hsu, RR; Su, HT; Chen, AB; Fukunishi, H; Takahashi, Y, Simultaneous radio and satellite optical measurements of high-altitude sprite current and lightning continuing current, Journal of Geophysical Research, vol 111 no. 10 (2006) [10.1029/2006JA011809] [abs].
  • Cummer, SA; Jaugey, N; Li, J; Lyons, WA; Nelson, TE; Gerken, EA, Submillisecond imaging of sprite development and structure, Geophysical Research Letters, vol 33 no. 4 (2006) [10.1029/2005GL024969] [abs].
  • Farrell, WM; Renno, N; Delory, GT; Cummer, SA; Marshall, JR, Integration of electrostatic and fluid dynamics within a dust devil, Journal of Geophysical Research, vol 111 no. 1 (2006) [10.1029/2005JE002527] [abs].
  • Popa, BI; Cummer, SA, Direct measurement of evanescent wave enhancement inside passive metamaterials, Physical Review E: Statistical, Nonlinear, and Soft Matter Physics, vol 73 no. 1 (2006) [10.1103/PhysRevE.73.016617] [abs].
  • Cummer, SA; Popa, BI; Schurig, D; Smith, DR; Pendry, J, Full-wave simulations of electromagnetic cloaking structures, Physical Review E: Statistical, Nonlinear, and Soft Matter Physics, vol 74 no. 3 (2006) [10.1103/PhysRevE.74.036621] [abs].
  • Farrell, WM; Marshall, JR; Cummer, SA; Delory, GT; Desch, MD, A model of the ULF magnetic and electric field generated from a dust devil, Journal of Geophysical Research, vol 111 no. 11 (2006) [10.1029/2006JE002689] [abs].
  • Xu, Y; Cummer, SA; Farrell, WM, Application of an orbital radar sounder model to detecting Martian polar subsurface features, Journal of Geophysical Research, vol 111 no. 6 (2006) [10.1029/2005JE002547] [abs].
  • Zhai, Y; Cummer, SA; Farrell, WM, Quasi-electrostatic field analysis and simulation of Martian and terrestrial dust devils, Journal of Geophysical Research, vol 111 no. 6 (2006) [10.1029/2005JE002618] [abs].
  • Brown, A; Ybarra, G; Massoud, H; Board, J; Holmes, J; Coonley, K; Collins, L; Huettel, L; Gustafson, M; Cummer, S, Redesign of the core curriculum at Duke University, ASEE Annual Conference and Exposition, Conference Proceedings (2006) [abs].
  • Cheng, Z; Cummer, SA, Broadband VLF measurements of lightning-induced ionospheric perturbations, Geophysical Research Letters, vol 32 no. 8 (2005), pp. 1-4 [10.1029/2004GL022187] [abs].
  • Frey, HU; Mende, SB; Cummer, SA; Chen, AB; Hsu, RR; Su, HT; Chang, YS; Adachi, T; Fukunishi, H; Takahashi, Y, Beta-type stepped leader of elve-producing lightning, Geophysical Research Letters, vol 32 no. 13 (2005), pp. 1-4 [10.1029/2005GL023080] [abs].
  • Zhai, Y; Cummer, SA, A flexible and robust direct reconstruction method for magnetospheric radio tomography, Radio Science, vol 40 no. 3 (2005), pp. RS3004-RS3022 [10.1029/2004RS003100] [abs].
  • Cummer, SA; Zhai, Y; Hu, W; Smith, DM; Lopez, LI; Stanley, MA, Measurements and implications of the relationship between lightning and terrestrial gamma ray flashes, Geophysical Research Letters, vol 32 no. 8 (2005), pp. 1-5 [10.1029/2005GL022778] [abs].
  • Cummer, SA; Lyons, WA, Implications of lightning charge moment changes for sprite initiation, Journal of Geophysical Research, vol 110 no. A4 (2005) [10.1029/2004JA010812] [abs].
  • Popa, BI; Cummer, SA, Determining the effective electromagnetic properties of negative-refractive-index metamaterials from internal fields, Physical Review B: Condensed Matter and Materials Physics, vol 72 no. 16 (2005) [10.1103/PhysRevB.72.165102] [abs].
  • Lyons, WA; Cummer, SA, Lightning characteristics of the aurora, NE record hailstone-producing supercell of 22-23 June 2003 during BAMEX, 85th AMS Annual Meeting, American Meteorological Society - Combined Preprints (2005), pp. 5685-5690 [abs].
  • Collins, LM; Huettel, LG; Brown, AS; Ybarra, GA; Holmes, JS; Board, JA; Cummer, SA; Gustafson, MR; Kim, J; Massoud, HZ, Theme-based redesign of the duke university ECE curriculum: The first steps, ASEE Annual Conference and Exposition, Conference Proceedings (2005), pp. 14313-14326 [abs].
  • Farrell, WM; Smith, PH; Delory, GT; Hillard, GB; Marshall, JR; Catling, D; Hecht, M; Tratt, DM; Renno, N; Desch, MD; Cummer, SA; Houser, JG; Johnson, B, Electric and magnetic signatures of dust devils from the 2000-2001 MATADOR desert tests, Journal of Geophysical Research, vol 109 no. E3 (2004) [10.1029/2003JE002088] [abs].
  • Cummer, SA; Lyons, WA, Lightning charge moment changes in U.S. High Plains thunderstorms, Geophysical Research Letters, vol 31 no. 5 (2004) [abs].
  • Cummer, SA, Perfectly matched layer behavior in negative refractive index materials, IEEE Antennas and Wireless Propagation Letters, vol 3 no. 1 (2004), pp. 172-175 [10.1109/LAWP.2004.833710] [abs].
  • Cummer, SA; Popa, BL, Wave fields measured inside a negative refractive index metamaterial, Applied Physics Letters, vol 85 no. 20 (2004), pp. 4564-4566 [10.1063/1.1823595] [abs].
  • Hu, W; Cummer, SA, The nearly perfectly matched layer is a perfectly matched layer, IEEE Antennas and Wireless Propagation Letters, vol 3 no. 1 (2004), pp. 137-140 [10.1109/LAWP.2004.831077] [abs].
  • Antunovic, M; Cummer, SA, Adaptive filter for event-based signal extraction, Automatika (Croatia), vol 45 no. 3-4 (2004), pp. 129-135 [abs].
  • Farrell, WM; Smith, PH; Delory, GT; Hillard, GB; Marshall, JR; Catling, D; Hecht, M; Tratt, DM; Renno, N; Desch, MD; Cummer, SA; Houser, JG; Johnson, B, Electric and magnetic signatures of dust devils from the 2000-2001 MATADOR desert tests, Journal of Geophysical Research E: Planets, vol 109 no. 3 (2004) [abs].
  • Antunovic, M; Cummer, SA, Event driven adaptive filtering, Proceedings of the Mediterranean Electrotechnical Conference - MELECON, vol 1 (2004), pp. 251-254 [abs].
  • Cummer, SA, Current moment in sprite-producing lightning, Journal of Atmospheric and Solar-Terrestrial Physics, vol 65 no. 5 (2003), pp. 499-508 [10.1016/S1364-6826(02)00318-8] [abs].
  • Cummer, SA, Simulated causal subwavelength focusing by a negative refractive index slab, Applied Physics Letters, vol 82 no. 10 (2003), pp. 1503-1505 [10.1063/1.1554778] [abs].
  • Cummer, SA; Green, JL; Reinisch, BW; Fung, SF; Kaiser, ML; Pickett, JS; Christopher, I; Mutel, R; Gurnett, DA; Escoubet, CP, Advances in magnetospheric radio wave analysis and tomography, Advances in Space Research, vol 32 no. 3 (2003), pp. 329-336 [10.1016/S0273-1177(03)90271-7] [abs].
  • Farrell, WM; Delory, GT; Cummer, SA; Marshall, JR, A simple electrodynamic model of a dust devil, Geophysical Research Letters, vol 30 no. 20 (2003) [abs].
  • Barros Ana, P; Lang Timothy, J, Monitoring the monsoon in the Himalayas: Observations in Central Nepal, June 2001, Monthly Weather Review, vol 131 no. 7 (2003), pp. 1408-1427 [10.1175/1520-0493(2003)1312.0.CO;2] [abs].
  • Cummer, SA, A simple, nearly perfectly matched layer for general electromagnetic media, IEEE Microwave and Wireless Components Letters, vol 13 no. 3 (2003), pp. 128-130 [10.1109/LMWC.2003.810124] [abs].
  • Lyons, WA; Nelson, TE; Williams, ER; Cummer, SA; Stanley, MA, Characteristics of sprite-producing positive cloud-to-ground lightning during the 19 July 2000 STEPS mesoscale convective systems, Monthly Weather Review, vol 131 no. 10 (2003), pp. 2417-2427 [2.0.CO;2" >10.1175/1520-0493(2003)131<2417:COSPCL>2.0.CO;2] [abs].
  • Cummer, SA, Dynamics of causal beam refraction in negative refractive index materials, Applied Physics Letters, vol 82 no. 13 (2003), pp. 2008-2010 [10.1063/1.1564289] [abs].
  • Hu, W; Cummer, SA, A new FDTD model for lightning generated EM wave simulation, IEEE Antennas and Propagation Society, AP-S International Symposium (Digest), vol 3 (2003), pp. 1061-1064 [abs].
  • Xu, Y; Cummer, SA, Applying the nonuniform FFT to the parabolic equation split-step algorithm for high frequency propagation modeling, IEEE Antennas and Propagation Society, AP-S International Symposium (Digest), vol 2 (2003), pp. 598-601 [abs].
  • Hu, W; Cummer, SA; Lyons, WA; Nelson, TE, Lightning charge moment changes for the initiation of sprites, Geophysical Research Letters, vol 29 no. 8 (2002) [abs].
  • Østgaard, N; Stadsnes, J; Bjordal, J; Germany, GA; Vondrak, RR; Parks, GK; Cummer, SA; Chenette, DL; Pronko, JG, Auroral electron distributions derived from combined UV and X-ray emissions, Journal of Geophysical Research, vol 106 no. A11 (2001), pp. 26081-26089 [abs].
  • Cummer, SA; Füllekrug, M, Unusually intense continuing current in lightning produces delayed mesospheric breakdown, Geophysical Research Letters, vol 28 no. 3 (2001), pp. 495-498 [10.1029/2000GL012214] [abs].
  • Cummer, SA; Reiner, MJ; Reinisch, BW; Kaiser, ML; Green, JL; Benson, RF; Manning, R; Goetz, K, A test magnetospheric radio tomographic imaging with IMAGE and WIND, Geophysical Research Letters, vol 28 no. 6 (2001), pp. 1131-1134 [10.1029/2000GL012683] [abs].
  • Østgaard, N; Stadsnes, J; Bjordal, J; Vondrak, RR; Cummer, SA; Chenette, DL; Schulz, M; Parks, GK; Brittnacher, MJ; McKenzie, DL; Pronko, JG, Global X-ray emission during an isolated substorm - A case study, Journal of Atmospheric and Solar-Terrestrial Physics, vol 62 no. 10 (2000), pp. 889-900 [abs].
  • Østgaard, N; Stadsnes, J; Bjordal, J; Vondrak, RR; Cummer, SA; Chenette, DL; Schulz, M; Pronko, JG, Cause of the localized maximum of X-ray emission in the morning sector: A comparison with electron measurements, Journal of Geophysical Research, vol 105 no. A9 (2000), pp. 20869-20883 [abs].
  • Cummer, SA; Vondrak, RR; Ostgaard, N; Stadsnes, J; Bjordal, J; Chenette, DL; Brittnacher, MJ; Parks, GK; Sigwarth, JB; Frank, LA, Global multispectral auroral imaging of an isolated substorm, Geophysical Research Letters, vol 27 no. 5 (2000), pp. 637-640 [10.1029/1999GL003678] [abs].
  • Stanley, M; Brook, M; Krehbiel, P; Cummer, SA, Detection of daytime sprites via a unique sprite ELF signature, Geophysical Research Letters, vol 27 no. 6 (2000), pp. 871-874 [10.1029/1999GL010769] [abs].
  • Cummer, SA, Modeling electromagnetic propagation in the Earth-ionosphere waveguide, IEEE Transactions on Antennas and Propagation, vol 48 no. 9 (2000), pp. 1420-1429 [10.1109/8.898776] [abs].
  • Cummer, SA; Inan, US, Ionospheric E region remote sensing with ELF radio atmospherics, Radio Science, vol 35 no. 6 (2000), pp. 1437-1444 [10.1029/2000RS002335] [abs].
  • Cummer, SA; Inan, US, Modeling ELF radio atmospheric propagation and extracting lightning currents from ELF observations, Radio Science, vol 35 no. 2 (2000), pp. 385-394 [10.1029/1999RS002184] [abs].
  • Farrell, WM; Kaiser, ML; Desch, MD; Houser, JG; Cummer, SA; Wilt, DM; Landis, GA, Detecting electrical activity from Martian dust storms, Journal of Geophysical Research E: Planets, vol 104 no. E2 (1999), pp. 3795-3801 [abs].
  • Cummer, SA; Stanley, M, Submillisecond resolution lightning currents and sprite development: Observations and implications, Geophysical Research Letters, vol 26 no. 20 (1999), pp. 3205-3208 [10.1029/1999GL003635] [abs].
  • Barrington-Leigh, CP; Inan, US; Stanley, M; Cummer, SA, Sprites triggered by negative lightning discharges, Geophysical Research Letters, vol 26 no. 24 (1999), pp. 3605-3608 [10.1029/1999GL010692] [abs].
  • Cummer, SA; Farrell, WM, Radio atmospheric propagation on Mars and potential remote sensing applications, Journal of Geophysical Research E: Planets, vol 104 no. E6 (1999), pp. 14149-14157 [abs].
  • Østgaard, N; Stadsnes, J; Bjordal, J; Vondrak, RR; Cummer, SA; Chenette, DL; Parks, GK; Brittnacher, MJ; McKenzie, DL, Global-scale electron precipitation features seen in UV and X rays during substorms, Journal of Geophysical Research, vol 104 no. A5 (1999), pp. 10191-10204 [abs].
  • Cummer, SA; Inan, US; Bell, TF; Barrington-Leigh, CP, ELF radiation produced by electrical currents in sprites, Geophysical Research Letters, vol 25 no. 8 (1998), pp. 1281-1284 [abs].
  • Cummer, SA; Inan, US; Bell, TF, Ionospheric D region remote sensing using VLF radio atmospherics, Radio Science, vol 33 no. 6 (1998), pp. 1781-1792 [abs].
  • Foster, JC; Cummer, S; Inan, US, Midlatitude particle and electric field effects at the onset of the November 1993 geomagnetic storm, Journal of Geophysical Research, vol 103 no. A11 (1998), pp. 26359-26366 [abs].
  • Cummer, SA; Inan, US, Measurement of charge transfer in sprite-producing lightning using ELF radio atmospherics, Geophysical Research Letters, vol 24 no. 14 (1997), pp. 1731-1734 [abs].
  • Cummer, SA, VLF remote sensing of high-energy auroral particle precipitation, Journal of Geophysical Research, vol 102 no. A4 (1997), pp. 7477-7484 [abs].
  • Kelley, MC; Baker, SD; Holzworth, RH; Argo, P; Cummer, SA, LF and MF observations of the lightning electromagnetic pulse at ionospheric altitudes, Geophysical Research Letters, vol 24 no. 9 (1997), pp. 1111-1114 [abs].
  • Cummer, SA, An Analysis of New and Existing FDTD methods for isotropie cold plasma and a method for improving their accuracy, IEEE Transactions on Antennas and Propagation, vol 45 no. 3 (1997), pp. 392-400 [10.1109/8.558654] [abs].
  • Cummer, SA; Bell, TF; Inan, US; Zanetti, LJ, VLF remote sensing of the auroral electrojet, Journal of Geophysical Research, vol 101 no. A3 (1996), pp. 5381-5389 [10.1029/95JA03409] [abs].
  • Bell, TF; Inan, US; Danielson, MT; Cummer, SA, VLF signatures of ionospheric heating by HIPAS, Radio Science, vol 30 no. 6 (1995), pp. 1855-1867 [10.1029/95RS02191] [abs].
  • Cummer, SA, Another new FDTD method for linear dispersive media - but this one's the best yet, IEEE Antennas and Propagation Society, AP-S International Symposium (Digest), vol 1 (1995), pp. 208-211 [abs].