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V

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.

T

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.

S

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.