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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.
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Tkalcevic, S, Inan US, Helliwell RA.  1984.  Nonlinear pitch angle scattering and trapping of energetic particles during Landau resonance interactions with whistler mode waves. Journal of Geophysical Research. 89:10813-10826.
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Stiles, G  S, Helliwell RA.  1977.  Stimulated growth of coherent VLF waves in the magnetosphere. Journal of Geophysical Research. 82:523-530.
Stiles, G  S, Helliwell RA.  1975.  Frequency-time behavior of artificially stimulated VLF emissions. Journal of Geophysical Research. 80:608-618.
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.
Sonwalkar, VS, Helliwell RA, Inan US.  1990.  Wideband VLF electromagnetic bursts observed on the DE 1 satellite. Geophysical Research Letters. 17:1861-1864.
Sonwalkar, VS, Carpenter DL, Helliwell RA, Walt M, Inan US, Caudle D  L, Ikeda M.  1997.  Properties of the magnetospheric hot plasma distribution deduced from whistler mode wave injection at 2400 Hz: Ground-based detection of azimuthal structure in magnetospheric hot plasmas. Journal of Geophysical Research. 102:14363-14380.
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.
Sonwalkar, VS, Inan US, Bell TF, Helliwell RA, Chmyrev V  M, Sobolev Y  P, Ovcharenko O  Y, Selegej V.  1994.  Simultaneous observations of VLF ground transmitter signals on the DE 1 and COSMOS 1809 satellites: Detection of a magnetospheric caustic and a duct. Journal of Geophysical Research. 99:17511-17522.
Smith, R  L, Helliwell RA.  1960.  Electron Densities to 5 Earth Radii Deduced from Nose Whistlers. Journal of Geophysical Research. 65:2583.
Smith, R  L, Helliwell RA, Yabroff I  W.  1960.  A Theory of Trapping of Whistlers in Field-Aligned Columns of Enhanced Ionization. Journal of Geophysical Research. 65:815.
Shawhan, S  D, Gurnett DA, Odem D  L, Helliwell RA, Park CG.  1981.  The plasma wave and quasi-static electric field instrument /PWI/ for dynamics Explorer-A. Space Science Instrumentation. 5:535-550.
Sa, L  A  D, Helliwell RA.  1988.  Structure of VLF whistler mode sideband waves in the magnetosphere. Journal of Geophysical Research. 93:1987-1992.
R
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.
Rosenberg, TJ, Helliwell RA, Katsufrakis J  P.  1971.  Electron Precipitation Associated with Discrete Very-Low-Frequency Emissions. Journal of Geophysical Research. 76:8445-8452.
Rorden, L  H, Helliwell RA, Smith R  L.  1963.  An Interpretation of LOFTI-I very-low-frequency observations, AGARDOGRAPH 74. Pergamon Press. :75-81.
Rastani, K, Inan US, Helliwell RA.  1985.  DE 1 observations of Siple transmitter signals and associated sidebands. Journal of Geophysical Research. 90:4128-4140.
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.
Raghuram, R, Bell TF, Helliwell RA, Katsufrakis J  P.  1977.  A quiet band produced by VLF transmitter signals in the magnetosphere. Geophysical Research Letters. 4:199-202.
P
Paschal, EW, Helliwell RA.  1984.  Phase measurements of whistler mode signals from the Siple VLF transmitter. Journal of Geophysical Research. 89:1667-1674.
Park, CG, Helliwell RA.  1977.  Whistler precursors - A possible catalytic role of power line radiation. Journal of Geophysical Research. 82:3634-3642.
Park, CG, Helliwell RA.  1971.  The formation by electric fields of field-aligned irregularities in the magnetosphere. Radio Science. 6:299.
Park, CG, Helliwell RA.  1981.  Power line radiation in the magnetosphere. Advances in Space Research. 1:423-437.
Park, CG, Helliwell RA.  1981.  Power line radiation in the magnetosphere. Advances in Space Research. 1:423-437.
Park, CG, Helliwell RA.  1980.  Power-Line Radiation. Science. 207:715.