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Journal Article
Helliwell, RA.  1975.  Coherent VLF waves in the magnetosphere. Royal Society of London Philosophical Transactions Series A. 280:137-149.
Rosenberg, TJ, Siren J  C, Matthews D  L, Marthinsen K, Holtet J  A, Egeland A, Carpenter DL, Helliwell RA.  1981.  Conjugacy of electron microbursts and VLF chorus. Journal of Geophysical Research. 86:5819-5832.
Luette, J  P, Park CG, Helliwell RA.  1979.  The control of the magnetosphere by power line radiation. Journal of Geophysical Research. 84:2657-2660.
Helliwell, RA.  1983.  Controlled stimulation of VLF emissions from Siple Station, Antarctica. Radio Science. 18:801-814.
Helliwell, RA.  1974.  Controlled VLF Wave Injection Experiments in the Magnetosphere. Space Science Reviews. 15:781-802.
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.
Helliwell, RA, Doolittle J  H, Armstrong W  C, Carpenter DL, Mende SB.  1980.  Correlation between lambda 4278 optical emissions and VLF wave events observed at L approximately 4 in the Antarctic. Journal of Geophysical Research. 85:3376-3386.
Mlodnosky, R  F, Helliwell RA, Rorden L  H.  1965.  Daytime Whistler-Mode Attenuation through the Lower Ionosphere at 15.5 Kc as Measured on Explorer VI during Launch Trajectory. NASA Special Publication. 54:91.
Rastani, K, Inan US, Helliwell RA.  1985.  DE 1 observations of Siple transmitter signals and associated sidebands. Journal of Geophysical Research. 90:4128-4140.
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 DS, 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.
Inan, US, Helliwell RA.  1982.  DE-1 observations of VLF transmitter signals and wave-particle interactions in the magnetosphere. Geophysical Research Letters. 9:917-920.
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.
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.  Direct observation of radiation belt electrons precipitated by the controlled injection of VLF signals from a ground-based transmitter. Geophysical Research Letters. 10:361-364.
Raghuram, R, Bell TF, Helliwell RA, Katsufrakis J  P.  1977.  Echo-induced suppression of coherent VLF transmitter signals in the magnetosphere. Journal of Geophysical Research. 82:2787-2796.
Smith, R  L, Helliwell RA.  1960.  Electron Densities to 5 Earth Radii Deduced from Nose Whistlers. Journal of Geophysical Research. 65:2583.
Rosenberg, TJ, Helliwell RA, Katsufrakis J  P.  1971.  Electron Precipitation Associated with Discrete Very-Low-Frequency Emissions. Journal of Geophysical Research. 76:8445-8452.
Inan, US, Chang H  C, Helliwell RA.  1984.  Electron precipitation zones around major ground-based VLF signalsources. Journal of Geophysical Research. 89:2891-2906.
Fraser-Smith, A  C, Helliwell RA.  1980.  ELF sferic occurrences in the Antarctic during a solar proton event - Case study of occurrences at Byrd Station during the event of June 9, 1968. Journal of Geophysical Research. 85:2296-2306.
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.
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.
Kimura, I, Hashimoto K, Matsumoto H, Mukai T, Bell TF, Inan US, Helliwell RA, Katsufrakis J  P.  1983.  EXOS-B/Siple station VLF wave-particle interaction experiments. I- General description and wave-particle correlations. Journal of Geophysical Research. 88:282-294.
Mielke, TA, Helliwell RA.  1992.  An experiment on the threshold effect in the coherent wave instability. Geophysical Research Letters. 19:2075-2078.
Helliwell, RA, Crystal T  L.  1973.  A Feedback Model of Cyclotron Interaction between Whistler-Mode Waves and Energetic Electrons in the Magnetosphere. Journal of Geophysical Research. 78:7357-7371.