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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.

Foster, JC, Park CG, Brace L H, Maier E J, Burrows J R, Hoffman J H, Whitteker J H. 1978. Plasmapause signatures in the ionosphere and magnetosphere. Journal of Geophysical Research. 83:1175-1182.

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.

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. 1980. Power-Line Radiation. Science. 207:715.

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.

Li, JD, Harid V, Spasojevic M, Gołkowski M, Inan US. 2015. Preferential amplification of rising versus falling frequency whistler mode signals. Geophysical Research Letters. :n/a-n/a.

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.

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.

Bell, TF, Helliwell RA. 1971. Pulsation Phenomena Observed in Long-Duration VLF Whistler-Mode Signals. Journal of Geophysical Research. 76:8414-8419.

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.

Reinisch, BW, Haines D M, Bibl K, Cheney G, Galkin I A, Huang X, Myers S H, Sales G S, Benson R F, Fung S F et al.. 2000. The Radio Plasma Imager investigation on the IMAGE spacecraft. Space Science Reviews. 91:319-359.

Green, JL, Benson R F, Fung S F, Taylor W W L, Boardsen S A, Reinisch BW, Haines D M, Bibl K, Cheney G, Galkin I A et al.. 2000. Radio plasma imager simulations and measurements. Space Science Reviews. 91:361-389.

Inan, US, Barrington-Leigh CP, Hansen S, Glukhov V S, Bell TF, Rairden R. 1997. Rapid lateral expansion of optical luminosity in lightning-induced ionospheric flashes referred to as `elves'. Geophysical Research Letters. 24:583-586.

Helliwell, RA, Mielke TA, Inan US. 1990. Rapid whistler-mode wave growth resulting from frequency-time curvature. Geophysical Research Letters. 17:599-602.

Marshall, RA, Adachi T, Hsu R-R, Chen AB. 2014. Rare examples of early VLF events observed in association with ISUAL-detected gigantic jets. Radio Science. 49(1):36-43.

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, Crystal T L. 1975. Reply. Journal of Geophysical Research. 80:4399-4400.

Imhof, W L, Gaines E E, Voss H D, Reagan J B, Datlowe D W, Mobilia J, Helliwell RA, Inan US, Katsufrakis J P, Joiner R G. 1985. Results from the SEEP active space plasma experiment - Effects onthe ionosphere. Radio Science. 20:511-518.

Helliwell, RA. 1995. The role of the Gendrin mode of VLF propagation in the generation of magnetospheric emissions. Geophysical Research Letters. 22:2095-2098.

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.

Chang, D C D, Helliwell RA, Bell TF. 1980. Side-band mutual interactions in the magnetosphere. Journal of Geophysical Research. 85:1703-1712.

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.

Bell, TF, Inan US, Helliwell RA, Scudder J D. 2000. Simultaneous triggered VLF emissions and energetic electron distributions observed on POLAR with PWI and HYDRA. Geophysical Research Letters. 27:165-168.