Publications
Refereed Journal Articles
2025
Sam, A., Kumar, P., Fletcher, A., Crabtree, C., Lee, N., & Elschot, S. "Nonlinear evolution, propagation, electron-trapping, and damping effects of ion-acoustic solitons using fully kinetic PIC simulations." : Physics of Plasmas 32, 022103 (2025). https://doi.org/10.1063/5.0249525
Lau, Raymond, and Sigrid Elschot. "A curvature-based mechanism for the spontaneous emission of electromagnetic radiation at curved plasma–vacuum interfaces." Physics of Plasmas 32.1 (2025). https://doi.org/10.1063/5.0250191
2024
Hedges, T., Lee, N., & Elschot, S. (2024). Meteor head echo detection at multiple high‐power large‐aperture radar facilities via a convolutional neural network trained on synthetic radar data. Journal of Geophysical Research: Space Physics, e2023JA032204. https://doi.org/10.1029/2023JA032204
Lau, R., Lee, N., & Elschot, S. (2024). Spatial decay of electromagnetic waves from hypervelocity impact plasmas. International Journal of Impact Engineering, 104924. https://doi.org/10.1016/j.ijimpeng.2024.104924
2023
Juarez Madera, D., Marshall, R. A., Elschot, S., Kaeppler, S., Reyes, P., Varney, R. H., & Crew, A. B. (2023). Time-dependent inversion of energetic electron precipitation spectra from ground-based Incoherent Scatter Radar measurements. Journal of Geophysical Research: Space Physics, 128, e2022JA031000. https://doi.org/10.1029/2022JA031000
Estacio, B., Young, S. A. Q., Lee, N., & Elschot, S. (2023). Experimental evidence of rapid target charging electromagnetic pulse from hypervelocity impact. International Journal of Impact Engineering, 173. https://doi.org/10.1016/j.ijimpeng.2022.104473
Lau, R., Lee, N., & Elschot, S. (2023). Collisional particle-in-cell investigations of electromagnetic pulses in hypervelocity impact plasmas. International Journal of Impact Engineering, 104692. https://doi.org/10.1016/J.IJIMPENG.2023.104692
Fereydooni, K., Lee, N., & Elschot, S. (2023). Preliminary study of radio frequency waves in hypervelocity impact plasma. International Journal of Impact Engineering, 179, 104667. https://doi.org/10.1016/J.IJIMPENG.2023.104667
2022
Hedges, T., Lee, N., and Elschot, S. (2022), Meteor Head Echo Analyses From Concurrent Radar Observations at AMISR Resolute Bay, Jicamarca, and Millstone Hill, JGR Space Physics, doi:10.1029/2022JA030709
Lee, N., Blanchard, J. T., Kawamura, K., Weldon, B., Ying, M., Young, S. A. Q., and Close, S. (2022), Supporting Uranus Exploration with Deployable Small Spacecraft Probes, Journal of Spacecraft and Rockets, doi:10.2514/1.A35436
Blanchard, J. T., Lee, N., and Elschot, S. (2022), Meteoroid orbit determination from HPLA radar data, Icarus, 386, 115144, doi:10.1016/j.icarus.2022.115144
Fereydooni, K., Evans, A. I., Lee, N., and Close, S. (2022), Plasma production and composition from hypervelocity impacts on solar cell cover glass, International Journal of Impact Engineering, doi:10.1016/j.ijimpeng.2022.104325
2021
Young, S. A. Q., Stupl, J., Lee, N. and Close, S. (2021), Theory of Power Generation From Spacecraft Charging, IEEE Transactions on Plasma Science, 50, 1, 141–154, doi:10.1109/TPS.2021.3125709
Hew, Y. M., and Close, S. (2021), Hypervelocity impact flash expansion geometry under various spacecraft surface electrical conditions, International Journal of Impact Engineering, 150, 103792, doi:10.1016/j.ijimpeng.2020.103792
Shohet, G., Estacio, B., Matthews, I., Young, S. A. Q., Lee, N., and Close, S. (2021), Microscopic ejecta measurements from hypervelocity impacts on aluminum and powdered regolith targets, International Journal of Impact Engineering, 152, 103840, doi:10.1016/j.ijimpeng.2021.103840.
Estacio, B., Shohet, G., Young, S. A. Q., Matthews, I., Lee, N., and Close, S. (2021), Dust and atmospheric influence on plasma properties observed in light gas gun hypervelocity impact experiments, International Journal of Impact Engineering, 151, 103833, doi:10.1016/j.ijimpeng.2021.103833.
2020
Nuttall, A. and Close, S. (2020), A thermodynamic analysis of hypervelocity impacts on metals, International Journal of Impact Engineering, 144, 103645, doi:10.1016/j.ijimpeng.2020.103645.
Limonta, L., Close, S., and Marshall, R. A. (2020), A technique for inferring lower thermospheric neutral density from meteoroid ablation, Planetary and Space Science, 180, 104735, doi:10.1016/j.pss.2019.104735.
2019
Tarano, A. M., Wheeler, L. F., Close, S., and Mathias, D. L. (2019), Inference of meteoroid characteristics using a genetic algorithm, Icarus, 329, 270-281 doi:10.1016/j.icarus.2019.04.002.
Sugar, G., Oppenheim, M. M., Dimant. Y. S., and Close, S. (2019), Formation of plasma around a small meteoroid: Electrostatic simulations, Journal of Geophysical Research: Space Physics, 124, doi:10.1029/2018ja026434.
2018
Hew, Y. M., Goel, A., Close, S. and Lee, N. (2018), Hypervelocity impact flash and plasma on electrically biased spacecraft surfaces, International Journal of Impact Engineering, 121, doi:10.1016/j.ijimpeng.2018.05.008.
Sugar ,G., Oppenheim, M. M., Dimant, Y. S., and Close, S. (2018), Formation of plasma around a small meteoroid: Simulation and theory, Journal of Geophysical Research: Space Physics, doi:10.1002/2018JA025265.
Lee, N. and Close, S. (2018), Meteoroid Impact Detection for Exploration of Asteroids: small satellites for asteroid characterization, Journal of Spacecraft and Rockets, 55(1), 202–213, doi:10.2514/1.A33928.
Tarantino, P., Goel, A., Corso, A., Lee, N., and Close, S. (2018), An electrostatic method to model the expansion of hypervelocity impact plasma on positively biased surfaces, Physics of Plasmas, 25(9), doi:10.1063/1.5039656
2017
Sugar, G., Moorhead A., Brown P., and Cooke W., Meteor shower detection with density‐based clustering, Meteoritics & Planetary Science, doi:10.1111/maps.12856.
Fletcher, A. and Close, S., Particle-in-cell simulations of an RF emission mechanism associated with hypervelocity impact plasmas, Physics of Plasmas, 24, 053102, doi:10.1063/1.4980833.
Goel, A., Krishnamoorthy, S., Swenson, T., West, S., Li, A., Crew, A., Philips, D. J., Screve, A., and Close, S., Design for CubeSat-based dust and radiation studies at Europa, Acta Astronautica, 136, 204--218, doi:10.1016/j.actaastro.2017.03.016.
Krishnamoorthy, S. and Close, S., Investigation of plasma-surface interaction effects on pulsed electrostatic manipulation for reentry blackout alleviation, J. Phys. D: App. Phys., 50(10), 105202, doi: 10.1088/1361-6463/aa5901.
2016
Nuttall, A., Kochenderfer, M. and Close, S. (2016), Detection of hypervelocity impact radio frequency pulses through prior constrained source separation, Radio Science, 51(10), 1660–1675, doi:10.1002/2016RS006108.
Li, A. and Close, S., Neutral density estimation derived from meteoroid measurements using high-power, large-aperture radar, J. Geophys. Res., 121(13), 8023–8037, doi:10.1002/2015JD024547.
2015
Fletcher, A., S. Close, and D. Mathias (2015), Simulating plasma production from hypervelocity impacts, Physics of Plasmas, 22, 093504, 1–11, doi:10.1063/1.4930281.
Li, A. and S. Close (2015), Mean thermospheric density estimation derived from satellite constellations, Adv. Space Res. 56(8), 1645–1657, doi:1016/j.asr.2015.07.022.
Marshall, R. A. and S. Close (2015), An FDTD model of scattering from meteor head plasma, J. Geophys. Res., 120(7), 5931–5942, doi:10.1002/2015JA021238.
Goel, A., Lee, N., Close, S. (2015), Estimation of hypervelocity impact parameters from measurements of optical flash. Int. J. Impact Eng., 84, 54-63, doi:10.1016/j.ijimpeng.2015.05.008.
Goel, A., Tarantino, P. M., Lauben, D. S., Close, S. (2015), Design and testing of miniaturized plasma sensor for measuring hypervelocity impact plasmas, Rev. Sci. Instrum., 86(4), doi:10.1063/1.4917276.
2014
[PDF] Frost, C. et al., Small Spacecraft Technology State of the Art. NASA/TP–2014–216648/REV1. July 2014.
[PDF] Marshall, R. A. (2014), Effect of self-absorption on attenuation of lightning and transmitter signals in the lower ionosphere, J. Geophys. Res. Space Physics, 119, doi:10.1002/2014JA019921.
[PDF] Marshall, R. A., T. Adachi, R.-R. Hsu, and A. B. Chen (2014), Rare examples of early VLF events observed in association with ISUAL-detected Gigantic Jets, Radio Sci., 49, 36–43, doi:10.1002/2013RS005288.
[PDF] Marshall, R. A., and J. B. Snively (2014), Very low frequency subionospheric remote sensing of thunderstorm-driven acoustic waves in the lower ionosphere, J. Geophys. Res. Atmos., 119, doi:10.1002/2014JD021594.
2013
[PDF] Yee, J. and Close, S., Plasma turbulence of nonspecular trail plasmas as measured by a high-power large-aperture radar, J. Geophys. Res., vol. 118, 24, 13, 449-462, 2013, doi:10.1002/2013JD020247.
[PDF] Close, S., I. Linscott, N. Lee, T. Johnson, D. Strauss, A. Goel, D. Lauben, R. Srama, A. Mocker, and S. Bugiel, Detection of electromagnetic pulses produced by hypervelocity micro particle impact plasmas, Physics of Plasmas, vol. 20, 092102, 1-8, 2013, doi:10.1063/1.4819777.
[PDF] Lee, N. and S. Close, Curved pleat folding for smooth wrapping, Proceedings of the Royal Society A, vol. 469, 20130152, 2013, doi:10.1098/rspa.2013.0152.
[PDF] Lee, N., S. Close, A. Goel, D. Lauben, I. Linscott, T. Johnson, D. Strauss, S. Bugiel, A. Mocker, and R. Srama, Theory and experiments characterizing hypervelocity impact plasmas on biased spacecraft materials, Physics of Plasmas, 20, 032901, 2013, doi:10.1063/1.4794331.
[PDF] Pifko, S., D. Janches, S. Close, J. J. Sparks, T. Nakamura, and D. Nesvorny, Modeling the meteoroid input function at mid-latitude using meteor observations by the MU radar, Icarus, 2013.
2012
[PDF] Volz, R. and S. Close, Inverse filtering of radar signals using compressed sensing with application to meteors, Radio Sci., 47, RS0N05, 2012, doi:10.1029/2011RS004889.
[PDF] Close, S., R. Volz, R. Loveland, A. Macdonell, P. Colestock, I. Linscott, M. Oppenheim, Determining meteoroid bulk densities using a plasma scattering model with high-power large-aperture radar data, Icarus, 221(1), 300-309, 2012, doi:10.1016/j.icarus.2012.07.033.
[PDF] Seo, J., J. Lee, S. Pullen, P. Enge, and S. Close, Targeted Parameter Inflation within Ground-Based Augmentation Systems to Minimize Anomalous Ionospheric Impact, Journal of Aircraft, 2012.
[PDF] Kelley, M., S. Pancoast, S. Close, Z. Wang, Analysis of electromagnetic and electrostatic effects of particle impacts on spacecraft, Adv. Space. Res., 2012.
[PDF] Lee, N., S. Close, D. Lauben, I. Linscott, A. Goel, T. Johnson, J. Yee, A. Fletcher, R. Srama, S. Bugiel, A. Mocker, P. Colestock, and S. Green, Measurements of freely-expanding plasma from hypervelocity impacts, Int. J. Impact Eng., 44, 40-49, 2012.
2011
[PDF] Vertatschitsch, L. E., J. D. Sahr, P. Colestock, and S. Close, Meteoroid head echo polarization features studied by numerical electromagnetics modeling, Radio Sci., 46, RS6016, 2011.
[PDF] Close, S., A. Fletcher, M. Dunham, and I. Linscott, Coherent Matched Filter Signal Processing Algorithms for Probing the Ionosphere Using Broadband RF Data, JGR, 116, 2011.
[PDF] Dymond, K. F., C. Watts, C. Coker, S. A. Budzien, P. A. Bernhardt, N. Kassim, T. J. Lazio, K. Weiler, P. C. Crane, P. S. Ray, A. Cohen, T. Clarke, L. J. Rickard, G. B. Taylor, F. Schinzel, Y. Pihlstrom, M. Kuniyoshi, S. Close, P. Colestock, S. Meyers, and A. Datta, A medium-scale traveling ionospheric disturbance observed from the ground and from space, Radio Sci., 46, RS5010, 2011.
[PDF] Loveland, R., A. Macdonell, S. Close, M. Oppenheim, and P. Colestock, Comparison of methods of determining meteoroid range rates from linear frequency modulated chirp pulses, Radio Sci., 46, 2011.
[PDF] Zinn, J., S. Close, P. L. Colestock, A. Macdonell, and R. Loveland, Analysis of ALTAIR 1998 meteor radar data, JGR, 116, 2011.
[PDF] Close, S., M. Kelley, L. Vertatschitsch, M. Oppenheim, and J. Yee, Polarization and scattering of a long-duration meteor trail, JGR, 116, 2011.
[PDF] Lay, E., S. Close, P. Colestock, G. Bust, Development and error analysis of Nonlinear Ionospheric Removal Algorithm for ionospheric electron density determination using broadband RF data, JGR, 116, 2011.
2010
[PDF] Close, S., P. Colestock, M. Kelley, L. Cox, N. Lee, Electromagnetic Pulses from Hypervelocity Impacts, JGR, 115, 2010.