Physics
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.2608f&link_type=abstract
Journal of Geophysical Research, vol. 84, June 1, 1979, p. 2608-2618.
Physics
4
Abundance, Alpha Particles, Energetic Particles, Helium Ions, Protons, Radiation Belts, Bandpass Filters, Energy Spectra, Explorer 45 Satellite, Radial Distribution, Tropical Regions
Scientific paper
Simultaneous monitoring of energetic helium ions and protons in the earth's radiation belts has been conducted with Explorer 45 in the immediate vicinity of the equatorial plane. Protons were measured from less than 1 keV to 1.6 MeV and also above 3.3 MeV in a channel responsive up to 22 MeV; helium ions were monitored in three passbands: 910 keV to 3.15 MeV, 590 to 910 keV, and 2.0 to 3.99 MeV. Alpha/proton flux ratios were found to vary significantly with energy and location in the radiation belts. At equal energy per nucleon a range of variability for alpha/p from 0.0001 to well above 0.001 was found, and at equal energy per ion the corresponding variability was from 0.001 to above 10. The latter findings emphasize the relative importance of the very energetic helium ions in the overall radiation belt ion populations.
Fritz Teresa A.
Spjeldvik Walther N.
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