Physics
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.3869r&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 88, April 20, 1983, p. 3869-3878. Research supported by the Lockheed Inde
Physics
12
Atmospheric Electricity, Cosmic Rays, Electrical Resistivity, Energetic Particles, Particle Precipitation, Solar Corpuscular Radiation, Solar Terrestrial Interactions, Current Density, Energy Spectra, Galactic Radiation, Ion Production Rates, Solar Electrons, Solar Protons
Scientific paper
Ion production rates and conductivities from the ground to 80 km at the peak intensity of the solar particle event on August 4, 1972, and for 30, 35, and 40 km for the 6-day duration of the event are presented. At the peak of the event, calculations inside the polar cap are made of the proton and electron precipitation currents, the ohmic current, and the vertical electric field. The particle precipitation currents at this time significantly exceed the normal air earth current at altitudes above 30 km and produce reversals in the vertical electric field at 28 km and above. Calculations are given of the vertical electric field at altitudes near 30 km, where balloon measurements were made. The good agreement between the calculated and measured vertical electric field is seen as proving the ability to calculate disturbed conductivities at these altitudes from satellite measurements of proton spectra incident on the atmosphere. It is concluded that the largest effect of a solar particle event of this magnitude on the atmospheric electric circuit is due to the Forbush decrease in the galactic cosmic ray flux rather than to the large increase in the solar proton flux.
Evans John E.
Imhof William L.
Joiner R. G.
Meyerott Roland E.
Reagan J. B.
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