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Book Chapter
Sonwalkar, VS.  1995.  Chapter 13 of Handbook of Atmospheric Electrodynamics. Handbook of Atmospheric Electrodynamics. II
Sonwalkar, VS.  1990.  Lightning, whistlers, and hiss - A possible relationship. Physics of Space Plasmas (1989). :477-482.
Conference Paper
Benson, R  F, Webb P  A, Green JL, Carpenter DL, Sonwalkar VS, James H  G, Reinisch BW.  2006.  Active Wave Experiments in Space Plasmas: The Z Mode. Geospace Electromagnetic Waves and Radiation. 687:3.
Journal Article
Masson, A, Santol\'ık O, Carpenter DL, Darrouzet F, Décréau PME, El-Lemdani Mazouz F, Green JL, Grimald S, Moldwin MB, N\v emec F et al..  2009.  Advances in Plasmaspheric Wave Research with CLUSTER and IMAGE Observations. Space Science Reviews. 145:137-191.
Sonwalkar, VS, Inan US, Bell TF, Helliwell RA, Molchanov O  A, Green JL.  1994.  DE 1 VLF observations during Activny wave injection experiments. Journal of Geophysical Research. 99:6173-6189.
Bell, TF, Inan US, Lauben D S, Sonwalkar VS, Helliwell RA, Sobolev Y  P, Chmyrev V  M, Gonzalez S.  1994.  DE-1 and COSMOS 1809 observations of lower hybrid waves excited by VLF whistler mode waves. Geophysical Research Letters. 21:653-656.
Bell, TF, Inan US, Sonwalkar VS, Helliwell RA.  1991.  DE-1 observations of lower hybrid waves excited by VLF whistler mode waves. Geophysical Research Letters. 18:393-396.
Sonwalkar, VS, Carpenter DL, Bell TF, Spasojevic M, Inan US, Li J, Chen X, Venkatasubramanian A, Harikumar J, Benson R  F et al..  2004.  Diagnostics of magnetospheric electron density and irregularitiesat altitudes <5000 km using whistler and Z mode echoes from radio sounding on the IMAGE satellite. Journal of Geophysical Research (Space Physics). 109:11212.
Sonwalkar, VS, Bell TF, Helliwell RA, Inan US.  1984.  Direct multiple path magnetospheric propagation - A fundamental property of nonducted VLF waves. Journal of Geophysical Research. 89:2823-2830.
Sonwalkar, VS, Inan US, Aggson T  L, Farrell W  M, Pfaff R.  1995.  Focusing of nonducted whistlers by the equatorial anomaly. Journal of Geophysical Research. 100:7783-7790.
Sonwalkar, VS, Inan US, Bell TF.  1995.  An interpretation of a mysterious 3.0- to 4.6-kHz emission band observed on Voyager 2 near Neptune. Journal of Geophysical Research. 100:1795-1809.
Sonwalkar, VS, Inan US.  1989.  Lightning as an embryonic source of VLF hiss. Journal of Geophysical Research. 94:6986-6994.
Draganov, A  B, Inan US, Sonwalkar VS, Bell TF.  1992.  Magnetospherically reflected whistlers as a source of plasmaspheric hiss. Geophysical Research Letters. 19:233-236.
Sonwalkar, VS, Carpenter DL.  1995.  Notes on the diversity of the properties of radio bursts observed on the nightside of Venus. Journal of Atmospheric and Terrestrial Physics. 57:557-573.
Carpenter, DL, Sonwalkar VS, Helliwell RA, Walt M, Inan US, Ikeda M, Caudle D  L.  1997.  Probing properties of the magnetospheric hot plasma distribution by whistler mode wave injection at multiple frequencies: Evidence of spatial as well as temporal wave growth. Journal of Geophysical Research. 102:14355-14362.
Sonwalkar, VS, Carpenter DL, Helliwell RA, Walt M, Inan US, Caudle D  L, Ikeda M.  1997.  Properties of the magnetospheric hot plasma distribution deduced from whistler mode wave injection at 2400 Hz: Ground-based detection of azimuthal structure in magnetospheric hot plasmas. Journal of Geophysical Research. 102:14363-14380.
Carpenter, DL, Galand M, Bell TF, Sonwalkar VS, Inan US, LaBelle J, Smith A  J, Clark T  D  G, Rosenberg TJ.  1997.  Quasiperiodic łt}formula\gt\~5-60s fluctuations of VLF signals propagating in the Earth-ionosphere waveguide: A result of pulsating auroral particle precipitation? Journal of Geophysical Research. 102:347-362.
Henderson, T  R, Sonwalkar VS, Helliwell RA, Inan US, Fraser-Smith A  C.  1993.  A search for ELF/VLF emissions induced by earthquakes as observed in the ionosphere by the DE 2 satellite. Journal of Geophysical Research. 98:9503-9514.
Sonwalkar, VS, Inan US, Bell TF, Helliwell RA, Chmyrev V  M, Sobolev Y  P, Ovcharenko O  Y, Selegej V.  1994.  Simultaneous observations of VLF ground transmitter signals on the DE 1 and COSMOS 1809 satellites: Detection of a magnetospheric caustic and a duct. Journal of Geophysical Research. 99:17511-17522.
Sonwalkar, VS, Carpenter DL, Strangeway R  J.  1991.  Testing radio bursts observed on the nightside of Venus for evidence of whistler mode propagation from lightning. Journal of Geophysical Research. 96:17763.
Sonwalkar, VS, Inan US.  1988.  Wave normal direction and spectral properties of whistler mode hiss observed on the DE 1 satellite. Journal of Geophysical Research. 93:7493-7514.
Sonwalkar, VS, Chen X, Harikumar J, Carpenter DL, Bell TF.  2001.  Whistler-mode wave-injection experiments in the plasmasphere with a radio sounder. Journal of Atmospheric and Solar-Terrestrial Physics. 63:1199-1216.
Draganov, A  B, Inan US, Sonwalkar VS, Bell TF.  1993.  Whistlers and plasmaspheric hiss - Wave directions and three-dimensional propagation. Journal of Geophysical Research. 98:11401.
Sonwalkar, VS, Helliwell RA, Inan US.  1990.  Wideband VLF electromagnetic bursts observed on the DE 1 satellite. Geophysical Research Letters. 17:1861-1864.
Carpenter, DL, Bell TF, Inan US, Benson R  F, Sonwalkar VS, Reinisch BW, Gallagher DL.  2003.  Z-mode sounding within propagation ``cavities'' and other inner magnetospheric regions by the RPI instrument on the IMAGE satellite. Journal of Geophysical Research (Space Physics). 108:1421.