Other
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996adspr..18..295d&link_type=abstract
Advances in Space Research, Volume 18, Issue 8, p. 295-298.
Other
3
Scientific paper
We examine the possibility of describing the magnetic moment change experienced by particles traveling through a field reversal by the action of an impulsive centrifugal force on the time scale of their cyclotron turn. It is shown that such a centrifugal impulse model applies to situations where the kappa parameter (defined as the square root of the minimum curvature radius-to-maximum Larmor radius ratio) is of the order of 1. It is demonstrated that the particle behavior can be organized by another parameter (referred to as kappa_alpha) which is proportional to kappa but involves the pitch angle, namely, one obtains: systematic magnetic moment enhancements for kappa_alpha ≪ 1, large gyrophase effects with possible damping of the magnetic moment for kappa_alpha ~ 1, and nearly constant magnetic moment for kappa_alpha > 1. When applied to ion transport in the near-Earth magnetotail, the model predictions are in agreement with numerical results, revealing enhanced trapping or detrapping of plasma sheet ions depending upon their pitch and phase angles.
Alem F.
Delcourt Dominique
Martin Richard F.
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