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Inan, US, Bell TF, Helliwell RA.  1977.  Coherent wave induced particle precipitation into the upper atmosphere. NATO ASIC Proc. 35: Dynamical and Chemical Coupling Between the Neutral and Ionized Atmosphere. :169-174.
Helliwell, RA.  1979.  Effects of power line radiation into the magnetosphere. Wave instabilities in space plasmas; Proceedings of the Symposium, Helsinki, Finland, July 31-August 8, 1978. (A80-21196 07-46) Dordrecht, D. Reidel Publishing Co., 1979, p. 27-36.. :27-36.
Helliwell, RA.  1979.  Effects of power line radiation into the magnetosphere. Wave instabilities in space plasmas; Proceedings of the Symposium, Helsinki, Finland, July 31-August 8, 1978. (A80-21196 07-46) Dordrecht, D. Reidel Publishing Co., 1979, p. 27-36.. :27-36.
Helliwell, RA.  1970.  Intensity of Discrete VLF Emissions. Particles and Field in the Magnetosphere. 17:292.
Helliwell, RA.  1979.  Siple station experiments on wave-particle interactions in the magnetosphere. Wave instabilities in space plasmas; Proceedings of the Symposium, Helsinki, Finland, July 31-August 8, 1978. (A80-21196 07-46) Dordrecht, D. Reidel Publishing Co., 1979, p. 191-203.. :191-203.
Helliwell, RA.  1972.  The structure of the plasmasphere on the basis of indirect measurements.. The Upper Atmosphere: Part IV of Solar-Terrestrial Physics/1970. :165-175.
Helliwell, RA.  1983.  VLF wave injections from the ground. ESA Special Publication. 195:3-9.
Helliwell, RA, Walworth K  F.  1996.  Whistler mode wave intensities in the radiation belts. American Institute of Physics Conference Series. 383:61-64.
Helliwell, RA.  1964.  Whistlers and VLF Emissions. Research in Geophysics, Volume 1: Sun, Upper Atmosphere, and Space. 1:319.
Helliwell, RA.  1968.  Whistlers and VLF Emissions. Physics of the Magnetosphere. 10:106.
Conference Proceedings
Journal Article