Physics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.1485d&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 18, Aug. 1991, p. 1485-1488.
Physics
9
Earth Ionosphere, Geomagnetism, Magnetic Storms, Plasma-Particle Interactions, Plasmasphere, Adiabatic Conditions, Auroral Zones, Depolarization, Magnetic Field Configurations, Magnetically Trapped Particles
Scientific paper
The nonadiabatic acceleration of plasma sheet ions during the expansion phase of substorms is examined by means of single-particle codes. It is shown that, in the near-earth plasma sheet, the gyration phase at substorm onset controls the net ion energization, as the gyro-period is locally comparable to the field variation time scale. This can yield a particularly significant decrease of the particle magnetic moment. It is accordingly argued that, via adiabatic invariant violation, the dipolarization of magnetospheric field lines can induce a 'de-trapping' of inner plasma sheet populations and, hence, give rise to short-lived precipitation enhancements over the auroral zone. As this effect depends upon cyclotron frequency, it is expected to occur at distinct latitudes for different ion species. This contrasts with nonadiabatic ion behavior further out into the geotail, which is characterized by intense perpendicular heating and a likely collective trapping.
Delcourt Dominique C.
Moore Thomas Earle
Sauvaud Jean-Andre
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