Coexistence of Short- and Long-Range Potential Gradients on Auroral Field Lines

Details Coexistence of Short- and Long-Range Potential Gradients on Auroral Field Lines Coexistence of Short- and Long-Range Potential Gradients on Auroral Field Lines

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm21b..06l&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SM21B-06

Physics

2704 Auroral Phenomena (2407), 2708 Current Systems (2409), 2712 Electric Fields (2411), 2451 Particle Acceleration

Scientific paper

Field-aligned potential gradients in the auroral region fall into two categories: short-ranged structures, usually double layers, which may arise from current-driven instabilities, and long-ranged potential gradients, which are required for pressure balance in the inhomogeneous magnetic field when the electrons and ions have different velocity space anisotropies. Observational evidence for both short- and long-range potential gradients has been reported. We present a model which attempts to incorporate double layers into a long-range potential by combining Sagdeev pseudopotentials with a Fokker-Planck-Poisson system of equations along a field line. The model is constrained with data from the FAST satellite. The results show that both short- and long-ranged potential gradients coexist on auroral field lines.

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