Self consistent one-dimensional hybrid code simulations of a relaxing field reversal

Details Self consistent one-dimensional hybrid code simulations of a relaxing field reversal Self consistent one-dimensional hybrid code simulations of a relaxing field reversal

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9917391r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A9, p. 17,391-17,404

Physics

5

Computerized Simulation, Field Strength, Geomagnetic Tail, Magnetic Relaxation, Reversing, Self Consistent Fields, Boundary Conditions, Field Aligned Currents, Magnetic Signatures, Polarization (Waves), Trapped Particles

Scientific paper

We present results of self-consistent one-dimensional hybrid code (kinetic ions and fluid electrons) simulations of a dipolarizing field reversal. Local ion energization processes are studied in terms of both the ion kinetics and bulk plasma behavior. We demonstrate evolution of the system through two phases: (1) a quasi-static 'trapping' phase, during which inflowing ions are trapped in the reversal structure at early times and (2) a dynamic 'escape' phase, during which trapped ions escape from the reversal after an increase in P(sub parallel). We perform simulations with different linking field component (GSE B(sub z)) to reversing component (GSE B(sub x)) ratios and show that this parameter controls the details of the ion energization. This study suggests a characteristic signature in the magnetic field (a bipolar B(sub y)) and bulk plasma parameters (an increase in P(sub parallel)) associated with this behavior which should be observable in in-situ data. Our results are applicable for times earlier than the midtail to ionosphere Alfven travel time.

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