NASA NTRS · 19800042655
Permanent magnetic trapping
Abstract
It is shown that the global nature of trapped particle motion in phase space makes it entirely plausible that particles with pitch angles near 90 deg are trapped for extremely long times, probably indefinitely. The long observed lifetimes of trapped particles can immediately be accounted for by this former population. For particles with low pitch angles an 'overstability' develops which serves to produce rapid variations in pitch angle and, presumably, random walk into the loss cone.
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Michel, F. C.. 1980-02-01. Permanent magnetic trapping. https://ntrs.nasa.gov/citations/19800042655
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