A simple model of magnetic moment scattering in a field reversal

Details A simple model of magnetic moment scattering in a field reversal A simple model of magnetic moment scattering in a field reversal

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.1543d&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 14, p. 1543-1546

Physics

19

Adiabatic Conditions, Field Theory (Physics), Magnetic Field Inversions, Magnetic Fields, Magnetic Moments, Magnetic Variations, Mathematical Models, Wave Scattering, Centrifugal Force, Geomagnetic Tail, Impulses, Magnetic Field Reconnection

Scientific paper

We examine the nonadiabatic motion of charged particles in a field reversal using a simple centrifugal impulse model. It is shown that, though this model cannot account for long term behaviors, it accurately describes the abrupt magnetic moment change experienced by the particles between two consecutive adiabatic (magnetic moment conserving) sequences. Good agreement is obtained between analytical estimates and trajectory computations. Our analysis also suggests a new pitch angle dependent parameter to characterize the jumps in magnetic moment. Application to particle motion in a cusped field geometry demonstrates that magnetic moment damping and subsequent particle escape can be adequately modeled by means of such centrifugal impulses.

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