Other
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aero.rept.....b&link_type=abstract
Interim Report Aerospace Corp., El Segundo, CA. Space Sciences Lab.
Other
Solar Activity, Solar Flux, Solar Protons, Sudden Storm Commencements, Earth Magnetosphere, Magnetometers, Satellite-Borne Instruments, Solar Wind, Trapped Particles
Scientific paper
The sudden commencement (sc) solar proton enhancement of 31 October 1972 is examined in detail. The flux of 5-21 MeV protons observed by ATS-1 increased by a factor of 25 as a result of the sudden commencement. Drift echoes (indicating trapped particles) were seen clearly following the sc with a period of the order of 70 seconds as expected for protons with energies just above 5 MeV. Decay times ranging from 17 to 56 minutes were seen during the decay. The decay time changed as the magnetosphere reacted to varying solar wind conditions which were indicated by ground-based magnetometer records. It is also shown that plasma intrusions into the outer magnetosphere from the solar wind, as discussed by Lemaire and colleagues, can serve as strong scattering centers, providing access for and greatly reducing the otherwise expected trapping lifetimes of sc-enhanced solar protons.
Bernard Blake J.
Paulikas George A.
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