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Helliwell, RA, Bell TF.  1960.  A New Mechanism for Accelerating Electrons in the Outer Ionosphere. Journal of Geophysical Research. 65:1839.
M
Imhof, W  L, Reagan J  B, Voss H  D, Gaines E  E, Datlowe D  W, Mobilia J, Helliwell RA, Inan US, Katsufrakis J  P, Joiner R  G.  1983.  The modulated precipitation of radiation belt electrons by controlled signals from VLF transmitters. Geophysical Research Letters. 10:615-618.
Helliwell, RA.  1977.  Modification of the propagation characteristics of the ionosphere (and the magnetosphere) by injection into the magnetosphere of whistler-mode waves. AGARD Artificial Modification of Propagation Media 8 p (SEE N77-19530 10-42).
Doolittle, JH.  1982.  Modification of the Ionosphere by VLF Wave-Induced Electron Precipitation.
Park, CG, Helliwell RA.  1978.  Magnetospheric effects of power line radiation. Science. 200:727-730.
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.  1975.  Magnetospheric chorus - Amplitude and growth rate. Journal of Geophysical Research. 80:3265-3270.
Burtis, WJ.  1974.  Magnetospheric Chorus.
Carpenter, DL.  1962.  The Magnetosphere during Magnetic Storms; A Whistler Analysis.
L
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.
Helliwell, RA.  1969.  Low-frequency waves in the magnetosphere.. Reviews of Geophysics and Space Physics. 7:281-303.
Dunckel, N.  1974.  Low-Frequency Radio Emissions from the Earth and Sun.
Dunckel, N, Ficklin B, Rorden L, Helliwell RA.  1970.  Low-frequency noise observed in the distant magnetosphere with OGO 1.. Journal of Geophysical Research. 75:1854-1862.
Luette, J  P, Park CG, Helliwell RA.  1977.  Longitudinal variations of very-low-frequency chorus activity in the magnetosphere - Evidence of excitation by electrical power transmission lines. Geophysical Research Letters. 4:275-278.
Voss, H  D, Imhof W  L, Walt M, Mobilia J, Gaines E  E, Reagan J  B, Inan US, Helliwell RA, Carpenter DL, Katsufrakis J  P.  1984.  Lightning-induced electron precipitation. Nature. 312:740-742.
Heyborne, R  L, Smith R  L, Helliwell RA.  1969.  Latitudinal Cutoff of VLF Signals in the Ionosphere. Journal of Geophysical Research. 74:2393.
J
Kimura, I, Matsumoto H, Hashimoto K, Mukai T, Helliwell RA, Bell TF, Inan US, Katsufrakis J  P.  1981.  Jikiken /EXOS-B/ observation of Siple transmissions. Advances in Space Research. 1:197-202.
I
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.
Scarabucci, RR.  1969.  Interpretation of VLF Signals Observed on the OGO-4 Satellite.
Rorden, L  H, Helliwell RA, Smith R  L.  1963.  An Interpretation of LOFTI-I very-low-frequency observations, AGARDOGRAPH 74. Pergamon Press. :75-81.
Grard, RJL.  1965.  Interpretation of Impedance Probe Measurements in the Ionosphere.
Helliwell, RA, Martin L  H.  1961.  The International Geophysical Month. Science. 134:1737-1738.
Helliwell, RA.  1970.  Intensity of Discrete VLF Emissions. Particles and Field in the Magnetosphere. 17:292.
H
Bell, TF, Helliwell RA, Inan US, Lauben D S.  1993.  The heating of suprathermal ions above thunderstorm cells. Geophysical Research Letters. 20:1991-1994.
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Gail, W B.  1987.  Gyroresonant Wave-Particle Interactions in a Dynamic Magnetosphere.