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Bell, TF, Helliwell RA.  1971.  Pulsation Phenomena Observed in Long-Duration VLF Whistler-Mode Signals. Journal of Geophysical Research. 76:8414-8419.
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.
Carpenter, DL, Sonwalkar VS, Helliwell RA, Walt M, Inan US, Ikeda M, Caudle D  L.  1997.  Probing properties of the magnetospheric hot plasma distribution by whistler mode wave injection at multiple frequencies: Evidence of spatial as well as temporal wave growth. Journal of Geophysical Research. 102:14355-14362.
Inan, US, Chang H  C, Helliwell RA, Imhof W  L, Reagan J  B, Walt M.  1985.  Precipitation of radiation belt electrons by man-made waves A comparison between theory and measurement. Journal of Geophysical Research. 90:359-369.
Park, CG, Helliwell RA.  1980.  Power-Line Radiation. Science. 207:715.
Helliwell, RA, Carpenter DL, Miller T  R.  1980.  Power threshold for growth of coherent VLF signals in the magnetosphere. Journal of Geophysical Research. 85:3360-3366.
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.
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.
Paschal, EW, Helliwell RA.  1984.  Phase measurements of whistler mode signals from the Siple VLF transmitter. Journal of Geophysical Research. 89:1667-1674.
Paschal, EW.  1988.  Phase Measurements of Very Low Frequency Signals from the Magnetosphere.
Carpenter, DL, Inan US, Trimpi M  L, Helliwell RA, Katsufrakis J  P.  1984.  Perturbations of subionspheric LF and MF signals due to whistler-induced electron precipitation bursts. Journal of Geophysical Research. 89(A11):9857-9862.
O
Dantas, NH.  1972.  OGO-4 Satellite Observations of Whistler-mode Propagation Effects Associated with Caustics in the Magnetosphere.
Heyborne, RL.  1966.  Observations of Whistler-mode Signals in the OGO Satellites from VLF Ground Station Transmitters.
Katsufrakis, J  P, Helliwell RA, James G.  1980.  Observations of Siple transmitter signals on the ISIS satellites. Antarctic Journal . XV(5):212-213.
N
Inan, US, Bell TF, Helliwell RA.  1978.  Nonlinear pitch angle scattering of energetic electrons by coherent VLF waves in the magnetosphere. Journal of Geophysical Research. 83:3235-3253.
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.
Tkalcevic, S.  1982.  Nonlinear Longitudinal Resonance Interaction of Energetic Charged Particles and VLF Waves in the Magnetosphere.
Crystal, TL.  1975.  Nonlinear Currents Stimulated by Monochromatic Whistler-Mode (WM) Waves in the Magnetosphere.
Walter, F.  1969.  Nonducted VLF Propagation in the Magnetosphere.
Bell, TF, Inan US, Helliwell RA.  1981.  Nonducted coherent VLF waves and associated triggered emissions observed on the ISEE-1 satellite. Journal of Geophysical Research. 86:4649-4670.
Mlodnosky, R  F, Carpenter DL, Helliwell RA.  1962.  Non-thermal noise measurements near planets. Int'l Astrophys. Symp. on the physics of Planets. 24:220-223.
Inan, US.  1977.  Non-linear Gyroresonant Interactions of Energetic Particles and Coherent VLF Waves in the Magnetosphere.
Sonwalkar, VS.  1986.  New Signal Analysis Techniques and Their Applications in Space Physics.
Hall, H.  1966.  A New Model for Impulsive Phenomena: Application to Atmospheric-noise Communication Channels Interpretation of Impedance Probe Measurements in the Ionosphere.