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2000
Helliwell, RA.  2000.  Triggering of whistler mode emissions by the band-limited impulse(BLI) associated with amplified Vlf signals from Siple Station, Antarctica. Geophysical Research Letters. 27:1455.
Bell, TF, Inan US, Helliwell RA, Scudder J  D.  2000.  Simultaneous triggered VLF emissions and energetic electron distributions observed on POLAR with PWI and HYDRA. Geophysical Research Letters. 27:165-168.
1997
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.
Helliwell, RA.  1997.  Whistlers, Discovery of the Magnetosphere. History of Geophysics. 7:83-94.
1996
Helliwell, RA, Walworth K  F.  1996.  Whistler mode wave intensities in the radiation belts. American Institute of Physics Conference Series. 383:61-64.
1995
Helliwell, RA.  1995.  The role of the Gendrin mode of VLF propagation in the generation of magnetospheric emissions. Geophysical Research Letters. 22:2095-2098.
1994
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, 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.
1993
Bell, TF, Helliwell RA, Inan US, Lauben D S.  1993.  The heating of suprathermal ions above thunderstorm cells. Geophysical Research Letters. 20:1991-1994.
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.
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.  1993.  Aspects of the Magnetospheric Amplification Phenomenon in Ducted Whistler-mode Waves.
1992
Mielke, TA, Helliwell RA.  1992.  An experiment on the threshold effect in the coherent wave instability. Geophysical Research Letters. 19:2075-2078.
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.
1991
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.
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.
1990
Gail, W  B, Inan US, Helliwell RA, Carpenter DL.  1990.  Gyroresonant wave-particle interactions in a dynamic magnetosphere. Journal of Geophysical Research. 95:15103-15112.
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.
Sonwalkar, VS, Helliwell RA, Inan US.  1990.  Wideband VLF electromagnetic bursts observed on the DE 1 satellite. Geophysical Research Letters. 17:1861-1864.
Gail, W  B, Inan US, Helliwell RA, Carpenter DL, Krishnaswamy S.  1990.  Characteristics of wave-particle interactions during sudden commencements. I - Ground-based observations. Journal of Geophysical Research. 95:119-137.
Helliwell, RA, Mielke TA, Inan US.  1990.  Rapid whistler-mode wave growth resulting from frequency-time curvature. Geophysical Research Letters. 17:599-602.
1989
Ngo, HD.  1989.  Electrostatic Waves Stimulated by VLF Whistler Mode Waves Scattering from Magnetic-field-aligned Plasma Density Irregularities.
de Sa, LAD.  1989.  Spectral Structure and Generation Mechanism of Ducted VLF Whistler Mode Sideband Waves.