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A
Allcock, G  M, Branigan C  K, Mountjoy J  C, Helliwell RA.  1963.  Whistler and Other Very-Low-Frequency Phenomena Associated with the High-Altitude Nuclear Explosion on July 9, 1962. Journal of Geophysical Research. 68:735-739.
B
Bell, TF, Inan US, Helliwell RA.  1980.  ISEE-1 satellite observations of VLF signals and associated triggered emissions from the Siple Station transmitter, IMS in Antarctica. First Int'l. Symposium on IMS in Melbourne. :128-144.
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, 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.
Bell, TF, Helliwell RA.  1971.  Pulsation Phenomena Observed in Long-Duration VLF Whistler-Mode Signals. Journal of Geophysical Research. 76:8414-8419.
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, Helliwell RA, Inan US, Lauben D S.  1993.  The heating of suprathermal ions above thunderstorm cells. Geophysical Research Letters. 20:1991-1994.
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, Helliwell RA.  1978.  The Stanford University VLF wave injection experiment on the ISEE-A spacecraft. IEEE Transactions on Geoscience Electronics. 16:248-252.
Bell, TF, Inan US, Helliwell RA.  1981.  Nonducted coherent VLF waves and associated triggered emissions observed on the ISEE-1 satellite. Journal of Geophysical Research. 86:4649-4670.
Burtis, W  J, Helliwell RA.  1976.  Magnetospheric chorus - Occurrence patterns and normalized frequency. Planetary and Space Science. 24:1007-1024.
Burtis, W  J, Helliwell RA.  1969.  Banded chorus - A new type of VLF radiation observed in the magnetosphere by OGO 1 and OGO 3.. Journal of Geophysical Research. 74:3002-3010.
Burtis, W  J, Helliwell RA.  1975.  Magnetospheric chorus - Amplitude and growth rate. Journal of Geophysical Research. 80:3265-3270.
C
Carlson, C  R, Helliwell RA, Carpenter DL.  1985.  Correction to ``Variable Frequency VLF Signals in the Magnetosphere: Associated Phenomena and Plasma Diagnostics''. Journal of Geophysical Research. 90(A7):6689-6689.
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.
Carlson, C  R, Helliwell RA, Carpenter DL.  1985.  Variable frequency VLF signals in the magnetosphere Associated phenomena and plasma diagnostics. Journal of Geophysical Research. 90:1507-1521.
Carpenter, DL, Inan US, Trimpi M  L, Helliwell RA, Katsufrakis J  P.  1984.  Perturbations of subionspheric LF and MF signals due to whistler-induced electron precipitation bursts. Journal of Geophysical Research. 89(A11):9857-9862.
Carpenter, DL, Helliwell RA.  1966.  Very-low-frequency phenomena. Antarctic Journal of U.S.. :193-194.
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.
Chang, D  C  D, Helliwell RA, Bell TF.  1980.  Side-band mutual interactions in the magnetosphere. Journal of Geophysical Research. 85:1703-1712.
Chang, D  C  D, Helliwell RA.  1979.  Emission triggering in the magnetosphere by controlled interruption of coherent VLF signals. Journal of Geophysical Research. 84:7170-7176.
Chang, D  C  D, Helliwell RA.  1980.  VLF pulse propagation in the magnetosphere. IEEE Transactions on Antennas and Propagation. 28:170-176.
D
Dunckel, N, Helliwell RA.  1969.  Whistler-Mode Emissions on the OGO 1 Satellite. Journal of Geophysical Research. 74:6371-6385.
Dunckel, N, Helliwell RA.  1977.  Spacecraft observations of man-made whistler-mode signals near the electron gyrofrequency. Radio Science. 12:821-829.
Dunckel, N, Helliwell RA, Vesecky J.  1972.  Type III Solar Noise Observed below 100 kHz on OGO 3. I. Description of Events. Solar Physics. 25:197-209.