Particle acceleration in a MHD simulation of magnetotail dynamics

Details Particle acceleration in a MHD simulation of magnetotail dynamics Particle acceleration in a MHD simulation of magnetotail dynamics

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..245b&link_type=abstract

Advances in Space Research, Volume 13, Issue 4, p. 245-248.

Physics

1

Scientific paper

The acceleration of protons in a dynamically evolving magnetotail is investigated on the basis of a three-dimensional resistive MHD simulation and the tracing of particles in the fields obtained from that simulation. The MHD simulation, representing plasmoid formation and ejection through a near-Earth reconnection process, generates cross-tail electric fields of up to about 4-mV/m, which lead to integrated potential differences across the tail of up to 200-kV. The large spatial extent of the increased electric field, which is largely associated with the plasma motion, together with the finite cross-tail extent suggest that acceleration might take place over a wide range of locations in x. This is confirmed by the particle tracing. An investigation of energized particles in the near-Earth region shows that these particles occupy a significant portion of the closed field line region inside of, but for moderate energies of tens of keV, not directly adjacent to, the separatrix.

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