Research Interest

Dr. Singh has nearly 20 years of experience in numerical modeling and simulation of electromagnetic and plasma systems. He has richly contributed to the field of space plasma research through particle simulation of complex plasma processes such as antennas in plasmas, formation of electric double layers, waves and instabilities, large-scale plasma flow and charging of spacecrafts. His most recent works have been on development of a 3-D plasma codes for satellite-plasma interactions in NASA’s tether project, and nonlinear evolution of waves in space plasmas; the codes employ the particle-in-cell method. The 3-D code was recently parallelized. Dr. Singh has recently developed a code for studying dynamical behavior of photorefractive materials used in nonlinear optics. He has also developed 1- and 2-D particle-in-cell codes for liquid crystal devices having widespread applications in displays.

Degrees

• B. Tech. in Electrical Engineering- Indian Institute of Technology, Kanpur, India, l966.
• M.S. in Electrical Engineering- California Institute of Technology, Pasadena, California, U.S.A., June l967.
• Ph.D. in Electrical Engineering- California Institute of Technology, Pasadena, California, U.S.A., June l970.

Recent Publications

Singh, N., G. Khazanov and A. Mukhter, Electrostatic wave generation and transverse ion acceleration by   Alfvenic wave components of broadband extremely low frequency turbulence, J. Geophys. Res., 112, A06210, doi: 10.1029/2006JA011933, June 8, 2007.

Singh, N., Interpretation of solar wind reconnection exhaust in terms of kinetic Alfvén wave group-velocity cones, Geophys. Res. Lett., 34, L13106, doi:10.1029/GL030299, 2007.

Khazanov, Igor and N. Singh, Ion and Electron Accelerations by Large-Scale Shear Alfvén Waves Via  Cross-Field Instabilities, Geophys, Res. Lett.,  doi:10.1029/ 2007GL031444, 2007.

Singh, N., Group Velocity Cones in Diverging Magnetic Reconnection Structures, Jour. Geophys. Res.   112, A07209, doi:10.1029/2006JA012219, 2007.

Coffey V. N., M. O. Chandler, N. Singh, L. Avanov, End-to-End Study of the Transfer of Energy from Magnetosheath Ion Precipitation to the Cusp, J. Atmos. Solar-Terr. Phys., 69, 50-55, doi:10.1016/j.jastp.2006.07.015, 2007.

Singh, N., I. Khazanov, Scattering of Long Wavelength Shear Alfvén Waves by a Localized Density Cavity, Geophys Res. Lett. 34, L05102, doi: 10.1029/2006GL028831, 2007.

Singh, N., Mapping of Poynting flux and widths of inertial Alfvén wave structures in high-latitude plasmas, J. Geophys. Res., 111, A06215, doi:10.1029/2005JA011571, 2006.

Singh, N., C. Deverapalli, and G. Khazanov, Electrodynamics in a very thin current sheet leading to magnetic reconnection, Nonlinear Proc. Geophys., 13, 1-15, 2006.

Singh, N., Mapping of poynting flux of dispersive Alfven waves, in Solar Influence on the Heliosphere and Earth's Environment, Recent Progress and Prospects, edited by N. Gopalswamy and A. Bhattacharys, p. 302, 2006.

Singh, N. C. Deverapalli, Thinning of Current sheets and magnetic reconnection, in Solar Influence on the Heliosphere and Earth's Environment, Recent Progress and Prospects, edited by N. Gopalswamy and A. Bhattacharys, p. 315, 2006.

Singh, N., Interrelation among, double layers, parallel electric fields, and density depletions, in Acceleration of Charged Particles in Astrophysical and Space Plasmas, AGU Monograph, Series 156, pp. 231-247, 2005.

Singh, N., C. Deverapalli, A. Rajagiri, and I. Khazanov, Dynamical Behavior of U-shaped double layers: Cavity formation and filamentary structures, Nonlin. Proc. Geophys., SREF - ID: 1607-7946/npg/2005.

Singh, N., C. Deverapalli, I. Khazanov, and G. Khazanov, Comparison of electric fields and density structures seen in simulations and satellite observations, Geophys. Res. Lett., 32, L13108, 2005.

Singh, N., and I. Khazanov , Planar double layers in magnetized plasmas: Fine structures and their consequences, J. Geophys. Res., 110, A04209, doi:10.1029/2004JA010620, 2005.

Singh, N., C. Deverapalli, I. Khazanov, N. Puthumbakum, and A. Rajagiri, Parallel electric Fields in a diverging flux tube with upward current: nature of quasistatic fields, J. Geophys. Res., Vol. 110, 2005.

Singh, N., Instabilities in a thin current sheet and their consequences, Nonlinear Processes in Geophysics, Vol. 11, pp.153-163, 2004.

Singh, N. and G. Khazanov, Numerical simulation of waves driven by plasma currents generated by low-frequency Alfven waves in a multi-ion plasma, J. Geophys. Res., vol 109, A05210, doi:10/1029/2003JA010251, 2004.

"Double Layers in Expanding Plasmas and Their Relevance to the Auroral Plasma Processes," N. Singh, and George Khazanov, Journal of Geophysical Research, 108, 8007 (2003).

"Space-time Evolution of Electron-beam Driven Electron Holes and Their Effects on the Plasma," N. Singh, Nonlinear Processes in Geophysics, 10, 53-63 (2003).

"Temporal and Spatial Features of Waves and Electron Holes Driven by Double Layers and Their Relevance to VLF Saucers," N. Singh, Geophysical Research Letters, 29, 1833 (2002).

"Spontaneous formation of current driven double layers in density depletions and its relevance to solitary Alfven waves," N. Singh, Geophys. Res. Lett., 29, 51-1 - 51-4, April (2002).

"Spiky parallel electrostatic in cyclotron/ion acoustic waves," R. V. Reddy, G. S. Lakhina, and N. Singh, Nonlinear Processes in Geophysics, 9, 25-29 (2002).

"Numerical model of the plasma sheath generated by the plasma source instrument aboard the Polar satellite," N. Singh, W. C. Leung, T. E. Moore, and P. D. Craven, Journal of Geophysical Research, 106, 19,179-19,192, September (2001).

"Electron hole as an antenna radiating plasma waves," N. Singh, S. M. Loo, and B. E. Wells, Geophys. Res. Lett., 28, 1371 (2001a).

"Evolution of electron beam generated waves resulting into transverse ion heating and filamentation of the plasma," N. Singh, S. M. Loo, B. Earl Wells, and G. S. Lahkina, J. Geophys. Res., 106, 21165-21182 (2001b).

"Electron hole structure depending on plasma magnetization," N. Singh, S. M. Loo, and B. Earl Wells, J. Geophys. Res., 106, 21183-21198 (2001c).

Gatlin, T., and N. Singh, Nonlinear frequency response of a moving grating with an applied field, Optics Communications, 191, 411-418, 2001.

Singh, N., Cross-current instability generated by pick-up ions in the environment of a large spacecraft in low Earth orbit, IEEE Trans. Plasma Science (Special Issue on Space Weather), 28, 2085-2096, 2000.

Singh, N., S. M. Loo, B. Earl Wells, and C. Deverapalli, Three-dimensional structure of electron holes driven by an electron beam, Geophys. Res. Lett., 27, 2469, 2000.

Singh, N., Electron holes as a common feature of plasma waves driven by a double layer, Geophys. Res. Lett., 27, 927, 2000.

Gatlin, T., and N. Singh, Nonlinear frequency response of a moving grating with an applied field in BSO, Optics Letters, 24, #22, 1593-95, 1999.

Singh, N., and W. C. Leung, Nonlinear features of electrostatic ion cyclotron instability driven by counterstreaming ion beams in equatorial outer plasmasphere, J. Geophys. Res., 104, 28,547-558, 1999.

Singh, N., Field patterns of Alfven wave resonance cones, J. Geophys. Res. 104, p. 6999, 1999.

Singh, N., and W. C. Leung, Applications of the particle-in-cell technique to liquid crystal devices, Optics Comm., 155, 281-287, 1998.

Singh, N., High altitude trapping of beam ions by self-generated plasma waves in interhemispheric plasma flows, Geophys. Res. Lett., 25, 1829, 1998.

Singh, N., B. Earl Wells, A. Abdelrazek, S. Al-Sharaeh, W. C. Leung, Three dimensional kinetic simulation of the nonlinear evolution of lower hybrid pump waves, J. Geophys. Res., 25, 9333-9349, 1998.

Singh, N., and W. C. Leung, Numerical simulation of the plasma processes occurring in the ram region of the tethered satellite, Geophys. Res. Lett., 25, 741-744, 1998.

Singh, N., S. P. Nadar, and Partha P. Banerjee, Time-dependent nonlinear photorefractive response to sinusoidal intensity gratings, Optics Comm., 136, 487-495, 1997.

Singh, N., W. C. Leung, and B. I. Vashi, Potential structure near a probe in flowing magnetoplasma and current collection, J. Geophys. Res., 102, 195-208, 1997.

Singh, N., S. Al-Sharaeh, A. Abdelrazek, W. C. Leung, and B. E. Wells, Three-dimensional numerical simulation of ion and electron acceleration by parametric decay of fast lower hybrid waves, Geophys. Res. Lett., 23, 3663, 1996.

Singh, N., and A. Jaggernauth, Ionization driven plasma dynamics in a high voltage sheath of a conducting body in the ionosphere, J. Geophys. Res., 101, 17229-17242, 1996.

Singh, N., Effects of electrostatic ion cyclotron wave instability on plasma flow during early stage plasmaspheric refilling, J. Geophys. Res., 101, 17,217-17,227, 1996.

Singh, N., B. I. Vashi and L. C. Leung, Three-dimensional numerical simulation of current collection by a probe in magnetic plasma, Geophys. Res. Lett., 21, 1994.

Singh, N., and V. S. Chaganti, Electron collection by a highly positive satellite in the ionosphere: test particle simulation, J. Geophys. Res., 99, 469, 1994.

Singh, N., and K.S. Hwang, Perpendicular Ion Heating Effects on the Refilling of the Outer Plasmasphere, J. Geophys. Res., 92, 13513, 1987.

Singh, N., H. Thiemann, and R.W. Schunk, Simulations of auroral plasma processes: Electric fields, waves, and particles, Planet. Space Sci., 35, 353, 1987.

Singh, N., H. Thiemann, and R.W. Schunk, Plasma processes driven by current sheets and their relevance to the auroral plasma, IEEE Trans. on Plasma Sci., PS 14, 805, l986.

Singh, N., H. Thiemann, and R.W. Schunk, Dynamical features and electric field strengths of double layers driven by currents, J. Geophys. Res., 90, 5l73, l985.

Singh, N., J.R. Conrad, and R.W. Schunk, EIC waves in a plasma with an ion beam and counterstreaming bulk electrons; waves in the zero-frequency band, J. Geophys. Res., 90, 122l9, l985.

Singh, N., J.R. Conrad, and R.W. Schunk, Electrostatic ion-cyclotron, beam-plasma and lower hybrid waves excited by an electron beam, J. Geophys. Res., 90, 5l59, l985.

Singh, N., and R.W. Schunk, Energization of ions in auroral plasma by broadband waves: Generation of conics, J. Geophys. Res., 89, 5538, l984.

Singh, N., and R.W. Schunk, Response of a plasma to the injection of an electron beam, Plasma Physics and Controlled Fusion, 26, 859, l984.

Singh, N., R.W. Schunk, and J.R. Conrad, Electrostatic hydrogen-cyclotron wave emissions below the hydrogen-cyclotron frequency in the auroral acceleration region, J. Geophys. Res., 89, l650, l984.

Singh, N., H. Thiemann, and R.W. Schunk, Simulation of auroral current sheet equilibria and associated V-shaped potential structures, Geophys. Res. Lett., 10, 745, l983.

Singh, N., R.W. Schunk, and J.J. Sojka, Preferential perpendicular acceleration of heavy ionospheric ions by interaction with electrostatic hydrogen cyclotron waves, J. Geophys. Res., 88, 4055, l983.

Singh, N., R.W. Schunk, and J. Sojka, Energization of ionosphere ions by electrostatic hydrogen cyclotron waves, Geophys. Res. Lett., 8, 1249, l981.