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Hurren, P  J, Smith A  J, Carpenter DL, Inan US.  1986.  Burst precipitation induced perturbations on multiple VLF propagation paths in Antarctica. Annales Geophysicae. 4:311-318.
Hospodarsky, G  B, Averkamp T  F, Kurth W  S, Gurnett DA, Dougherty M, Inan US, Wood T.  2001.  Wave normal and Poynting vector calculations using the Cassini radio and plasma wave instrument. Journal of Geophysical Research. 106:30253-30270.
Horne, R  B, Thorne R  M, Shprits Y  Y, Meredith N  P, Glauert S  A, Smith A  J, Kanekal S  G, Baker D  N, Engebretson M  J, Posch J  L et al..  2005.  Wave acceleration of electrons in the Van Allen radiation belts. Nature. 437:227-230.
Ho, D, Carpenter DL.  1976.  Outlying plasmasphere structure detected by whistlers. Planetary and Space Science. 24:987-994.
Ho, D, Bernard L  C.  1973.  A fast method to determine the nose frequency and minimum group delay of a whistler when the causative spheric is unknown. Journal of Atmospheric and Terrestrial Physics. 35:881.
Ho, D.  1973.  Interaction between Whistlers and Quasi-Periodic VLF Emissions. Journal of Geophysical Research. 78:7347-7356.
Heyborne, R  L, Smith R  L, Helliwell RA.  1969.  Latitudinal Cutoff of VLF Signals in the Ionosphere. Journal of Geophysical Research. 74:2393.
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.
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, Bell TF.  1960.  A New Mechanism for Accelerating Electrons in the Outer Ionosphere. Journal of Geophysical Research. 65:1839.
Helliwell, RA.  1988.  VLF wave-injection experiments from Siple Station, Antarctica. Advances in Space Research. 8:279-289.
Helliwell, RA.  1997.  Whistlers, Discovery of the Magnetosphere. History of Geophysics. 7:83-94.
Helliwell, RA, Brice NM.  1964.  Very Low Frequency Emission Periods and Whistler Mode Group Delays. Journal of Geophysical Research. 69:4704-4708.
Helliwell, RA.  1965.  Whistlers and Related Ionospheric Phenomena.
Helliwell, RA, Inan US, Katsufrakis J  P, Carpenter DL, Paschal EW.  1985.  Recent research on magnetospheric wave-particle interactions. National Institute Polar Research Memoirs. 38:83-98.
Helliwell, RA.  1961.  Exospheric electron density variations deduced from whistlers. Symposium d'Aéronomie Communications. :95.
Helliwell, RA, Carpenter DL.  1962.  Whistler-west results from the IGY-IGC-59 synoptic program. Trans. AGU. 43(1):125.
Helliwell, RA, Crystal T  L.  1975.  Reply. Journal of Geophysical Research. 80:4399-4400.
Helliwell, RA.  1983.  Controlled stimulation of VLF emissions from Siple Station, Antarctica. Radio Science. 18:801-814.
Helliwell, RA.  1965.  Generation of VLF radio noise in the ionosphere by energetic particle streams. Space Research V, North Holland Publ. Co., Amsterdam.
Helliwell, RA, Martin L  H.  1961.  The International Geophysical Month. Science. 134:1737-1738.
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.
Helliwell, RA.  1995.  The role of the Gendrin mode of VLF propagation in the generation of magnetospheric emissions. Geophysical Research Letters. 22:2095-2098.
Helliwell, RA.  1974.  VLF Wave Injection Into the MagnetosphereF rom Siple Station, Antarctica. JOURNAL OF GEOPHYSICAL RESEARCH. 79:2511-2518.
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.