Mechanisms for the Injection of Protons into the Magnetosphere
Energetic solar particles detected at low altitudes over the polar caps can be considered to be ‘probes’ of large regions of the outer magnetosphere including the magnetotail, and should help us to understand the physical processes occurring in the magneto-sphere. Flux profiles of low energy (∼ 1 MeV) solar protons over the polar caps have been studied by many workers, beginning with Williams and Bostrom (1967) and Blake et al. (1968). In this paper we try to identify some of the processes that lead to structure in the profiles in the region of closed field lines. We also show that the use of a suitable coordinate system improves our insight into the causes of structure observed on open field lines.
KeywordsPitch Angle Energetic Solar Particle Solar Proton Loss Cone Neutral Sheet
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