Particle acceleration during substorm growth and onset

Details Particle acceleration during substorm growth and onset Particle acceleration during substorm growth and onset

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17..587w&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 17, April 1990, p. 587-590.

Physics

13

Energetic Particles, Geomagnetic Tail, Magnetic Storms, Particle Acceleration, Current Sheets, Electron Flux Density, International Sun Earth Explorers, Ion Density (Concentration), Polar Substorms

Scientific paper

ISEE-1 observations of ion and electron energization made at 11 RE during a substorm event on April 2, 1978 are presented. An analysis of the dominant cross-tail current systems in this event (Mitchell et al., 1990) has made it possible to uniquely associate particle energization processes with the development and/or disruption of the cross-tail currents. It is found that significant ion acceleration occurs as the ions participate in serpentine cross-tail motion (Speiser, 1965), establishing the dominant plasma sheet current system just prior to onset. As this current disrupts, the magnetic field configuration dipolarizes and further ion energization and the bulk of the electron energization occurs. During dipolarization energization is due primarily to the inductive electric field, including betatron and Fermi acceleration processes.

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