Auroral electron acceleration by Alfvén waves and electrostatic fields

Details Auroral electron acceleration by Alfvén waves and electrostatic fields Auroral electron acceleration by Alfvén waves and electrostatic fields

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jgr...10525333r&link_type=abstract

Journal of Geophysical Research, Volume 105, Issue A11, p. 25333-25344

Physics

Plasma Physics

20

Magnetospheric Physics: Auroral Phenomena, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Space Plasma Physics: Electrostatic Structures, Space Plasma Physics: Numerical Simulation Studies

Scientific paper

We present a two-dimensional numerical model for the formation of discrete auroral arcs. This model describes the evolution of shear Alfvén waves generated by a growing force near the equatorial plane, and the transition to electrostatic fields when the force becomes stationary. The parallel electric fields on auroral field lines may be regarded as shear Alfvén waves driven by a magnetospheric generator at zero frequency. In our collisionless model, precipitating auroral electrons are accelerated to an energy of 350 eV when the upward current is 3.1 μAm-2. We also find that the electrostatic potential drop is proportional to the square of the current density.

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