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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.
M
Helliwell, RA.  1977.  Modification of the propagation characteristics of the ionosphere (and the magnetosphere) by injection into the magnetosphere of whistler-mode waves. AGARD Artificial Modification of Propagation Media 8 p (SEE N77-19530 10-42).
Park, CG, Helliwell RA.  1978.  Magnetospheric effects of power line radiation. Science. 200:727-730.
H
Bell, TF, Helliwell RA, Inan US, Lauben D S.  1993.  The heating of suprathermal ions above thunderstorm cells. Geophysical Research Letters. 20:1991-1994.
Inan, US, Bell TF, Rodriguez JV.  1991.  Heating and ionization of the lower ionosphere by lightning. Geophysical Research Letters. 18:705-708.
G
Gail, W  B, Inan US, Helliwell RA, Carpenter DL.  1990.  Gyroresonant wave-particle interactions in a dynamic magnetosphere. Journal of Geophysical Research. 95:15103-15112.
E
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.
C
Sa, L  A  D.  1989.  A cyclotron resonance mechanism for very-low-frequency whistler-mode sideband wave radiation. I - Introduction and description of external resonances. II - Description of internal ('trapped') resonances. III - Effect of the inhomogeneity on sideband reson. Journal of Applied Physics. 66:3482-3514.
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.