Generation of electron holes and electron heating in the auroral upward current (inverted V) region : A simulation study

Details Generation of electron holes and electron heating in the auroral upward current (inverted V) region : A simulation study Generation of electron holes and electron heating in the auroral upward current (inverted V) region : A simulation study

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm41b0571m&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM41B-0571

Physics

2704 Auroral Phenomena (2407), 7815 Electrostatic Structures, 7839 Nonlinear Phenomena, 7843 Numerical Simulation Studies, 7871 Waves And Instabilities

Scientific paper

The presence of electron holes in and their effects on the auroral plasma is well established fact. FAST measurements have shown that both in the upward and downward current regions such holes are accompanied by various kinds of particle beams, and it is believed that they form as a result of the nonlinear evolution of instabilities caused by these beams. We study various types of beam instabilities in application to the upward current region (downward auroral electron beam, upward ions, two-temperature electron plasma), using a one-dimensional full-particle simulation code. It is shown that several instabilities can contribute to the formation of holes and to their dynamics, but the most important one is the two-stream instability which can occure even under auroral conditions. We investigate the dynamics of the electron beam and the plasma under hole formation, plasma heating, and the evolution of the distribution functions in view of the application to the processes in the auroral upward current region.

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