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1990

Carlson, C R, Helliwell RA, Inan US. 1990. Space-time evolution of whistler mode wavegrowth in the magnetosphere. Journal of Geophysical Research. 95:15073-15089.

1991

Bell, TF, Helliwell RA, Hudson M K. 1991. Lower hybrid waves excited through linear mode coupling and the heating of ions in the auroral and subauroral magnetosphere. Journal of Geophysical Research. 96:11379.

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.

1992

Mielke, TA, Elkins C J, Helliwell RA, Inan US. 1992. Excitation of whistler mode signals via injection of polarized VLF waves with the Siple transmitter. Radio Science. 27:31-46.

Rodriguez, JV, Inan US, Li Y Q, Holzworth R H, Smith A J, Orville R E, Rosenberg TJ. 1992. A case study of lightning, whistlers, and associated ionospheric effects during a substorm particle injection event. Journal of Geophysical Research. 97:65-75.

Mielke, TA, Helliwell RA. 1992. An experiment on the threshold effect in the coherent wave instability. Geophysical Research Letters. 19:2075-2078.

1993

Mielke, TA. 1993. Aspects of the Magnetospheric Amplification Phenomenon in Ducted Whistler-mode Waves.

Ohnami, S, Hayakawa M, Bell TF, Ondoh T. 1993. Nonlinear wave-wave interactions in the subauroral ionosphere on the basis of ISIS-2 satellite observations of Siple station VLF signals. Geophysical Research Letters. 20:739-742.

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.

Mielke, TA, Helliwell RA. 1993. Siple Station, Antarctica, experiments on staircase frequency ramps as approximations to continuous ramps. Journal of Geophysical Research. 98:4053-4061.

Bell, TF, Helliwell RA, Inan US, Lauben D S. 1993. The heating of suprathermal ions above thunderstorm cells. Geophysical Research Letters. 20:1991-1994.

1994

Morrison, K, Engebretson M J, Beck J R, Johnson J E, Arnoldy R L, Cahill, Jr. L J, Carpenter DL. 1994. The ULF modulation of ELF-VLF emissions close to the magnetospheric boundary. Physical Signatures of Magnetospheric Boundary Layer Processes. :375.

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.

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.

1995

Calvert, W, Benson R F, Carpenter DL, Fung S F, Gallagher DL, Green JL, Haines D M, Reiff P H, Reinisch BW, Smith M F et al.. 1995. The feasibility of radio sounding in the magnetosphere. Radio Science. 30:1577-1596.

Helliwell, RA. 1995. The role of the Gendrin mode of VLF propagation in the generation of magnetospheric emissions. Geophysical Research Letters. 22:2095-2098.

1996

Inan, US, Reising SC, Fishman G J, Horack J M. 1996. On the association of terrestrial gamma-ray bursts with lightningand implications for sprites. Geophysical Research Letters. 23:1017-1020.

Helliwell, RA, Walworth K F. 1996. Whistler mode wave intensities in the radiation belts. American Institute of Physics Conference Series. 383:61-64.

1997

Helliwell, RA. 1997. Whistlers, Discovery of the Magnetosphere. History of Geophysics. 7:83-94.

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.

Inan, US, Barrington-Leigh CP, Hansen S, Glukhov V S, Bell TF, Rairden R. 1997. Rapid lateral expansion of optical luminosity in lightning-induced ionospheric flashes referred to as `elves'. Geophysical Research Letters. 24:583-586.

Kelley, M C, Baker S D, Holzworth R H, Argo P, Cummer SA. 1997. LF and MF observations of the lightning electromagnetic pulse at ionospheric altitudes. Geophysical Research Letters. 24:1111-1114.

1998

Benson, R F, Green JL, Fung S F, Reinisch BW, Calvert W, Haines D M, Bougeret JL, Manning R, Carpenter DL, Gallagher DL et al.. 1998. Magnetospheric Radio Sounding on the IMAGE Mission. URSI. 285(285):9-20.