Transverse ion heating, field-aligned electron acceleration, and parallel electric fields in the auroral acceleration region: Modeling several FAST events
Abstract
Many of the ions in the magnetosphere originate in the ionosphere, whence they are extracted by wave heating perpendicular to the magnetic field. Much of this ion heating occurs in regions where electrons are also accelerated along the magnetic field, and the differing anisotropies lead to a charge separation which is balanced by a parallel electric field.a Using a recently developed model which includes turbulent heating,b,c we investigate the distribution of parallel electric fields in several events measured with the FAST satellite. We investigate the effects of different model closures on the predicted parallel electric fields. The goal of the research is to develop a physics-based module of ion outflow to include in global models of the magnetosphere. a Alfvén, H., and C.-G. Fälthammar (1963), Cosmical Electrodynamics: Fundamental Principles, Clarendon Press, Oxford. b Jasperse, J. R., et al. (2006), Phys. Plasmas 13, 072903. c Jasperse, J. R., et al. (2006), Phys. Plasmas 13, 112902.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2008
- Bibcode:
- 2008AGUFMSM11C..02L
- Keywords:
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- 2451 Particle acceleration;
- 2704 Auroral phenomena (2407);
- 2712 Electric fields (2411);
- 2721 Field-aligned currents and current systems (2409);
- 2753 Numerical modeling