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Filters: Author is Robert A. Helliwell  [Clear All Filters]
1960
Martin, L  H, Helliwell RA.  1960.  Association between Auroræ and Very Low-Frequency Hiss Observed at Byrd Station, Antarctica. Nature. 187:751-753.
Helliwell, RA.  1960.  Summary of research on whistlers and related phenomena. J. Res. NBS. 64D(6):642.
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.
Smith, RL.  1960.  The Use of Nose Whistlers in the Study of the Outer Ionosphere.
Helliwell, RA, Bell TF.  1960.  A New Mechanism for Accelerating Electrons in the Outer Ionosphere. Journal of Geophysical Research. 65:1839.
Smith, R  L, Helliwell RA.  1960.  Electron Densities to 5 Earth Radii Deduced from Nose Whistlers. Journal of Geophysical Research. 65:2583.
1961
Helliwell, RA.  1961.  Exospheric electron density variations deduced from whistlers. Symposium d'Aéronomie Communications. :95.
Helliwell, RA, Martin L  H.  1961.  The International Geophysical Month. Science. 134:1737-1738.
Crary, JH.  1961.  The Effect of the Earth-Ionosphere Waveguide on Whistlers.
1962
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.
Helliwell, RA, Carpenter DL.  1962.  Whistler-west results from the IGY-IGC-59 synoptic program. Trans. AGU. 43(1):125.
Carpenter, DL.  1962.  The Magnetosphere during Magnetic Storms; A Whistler Analysis.
Mlodnosky, R  F, Helliwell RA.  1962.  Graphic Data on the Earth's Main Magnetic Field in Space. Journal of Geophysical Research. 67:2207-2214.
1963
Helliwell, RA.  1963.  Coupling between the ionosphere and the earth-ionosphere waveguide at very low frequencies. The Ionosphere. :452.
Rorden, L  H, Helliwell RA, Smith R  L.  1963.  An Interpretation of LOFTI-I very-low-frequency observations, AGARDOGRAPH 74. Pergamon Press. :75-81.
Helliwell, RA, Carpenter DL.  1963.  Whistlers Excited by Nuclear Explosions. Journal of Geophysical Research. 68:4409.
Allcock, G  M, Branigan C  K, Mountjoy J  C, Helliwell RA.  1963.  Whistler and Other Very-Low-Frequency Phenomena Associated with the High-Altitude Nuclear Explosion on July 9, 1962. Journal of Geophysical Research. 68:735-739.
Helliwell, RA.  1963.  Whistler-Triggered Periodic Very-Low-Frequency Emissions. Journal of Geophysical Research. 68:5387.
1964
Helliwell, RA.  1964.  Whistlers and VLF Emissions. Research in Geophysics, Volume 1: Sun, Upper Atmosphere, and Space. 1:319.
Bell, TF.  1964.  Wave Particle Gyroresonance Interactions in the Earth's Outer Ionosphere.
Brice, NM.  1964.  Discrete VLF Emissions from the Upper Atmosphere.
Guthart, H.  1964.  Whistlers in a Thermal Magnetosphere.
Helliwell, RA, Katsufrakis J  P, Trimpi M  L, Brice NM.  1964.  Artificially Stimulated Very Low Frequency Radiation from the Ionosphere. Journal of Geophysical Research. 69:2391-2394.
Helliwell, RA, Brice NM.  1964.  Very Low Frequency Emission Periods and Whistler Mode Group Delays. Journal of Geophysical Research. 69:4704-4708.
1965
Mlodnosky, R  F, Helliwell RA, Rorden L  H.  1965.  Daytime Whistler-Mode Attenuation through the Lower Ionosphere at 15.5 Kc as Measured on Explorer VI during Launch Trajectory. NASA Special Publication. 54:91.