Alpha Particles Trapped in the Earth’s Magnetic Field
The study of geomagnetically trapped α-particles, unlike other charged particle constituents of the radiation belts, has had a comparatively short history. The first comprehensive results were presented two years ago at the preceding Advanced Study Institute (McCormac, 1968) and the emphasis was on the validity of the experimental method as well as the physical significance of the results. Since that time, other experimenters have confirmed and expanded the initial results (Paulikas and Blake, 1968; Fritz and Krimigis, 1969) and now a comprehensive study of the absolute intensities, spatial and angular distributions, energy spectra, and time variations is under way. All of these studies, however, are limited by the difficulty of making reliable experimental measurements with adequate time resolution, so that meaningful experimental results may be obtained.
KeywordsSolar Wind Magnetic Storm Alpha Particle Geomagnetic Storm Radiation Belt
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