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Auroral Electron acceleration by Alfven waves and electrostatic fields
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
2000 (English)In: Journal of Geophysical Research, ISSN 0148-0227, E-ISSN 2156-2202, Vol. 105, no A11, 25333-25344 p.Article in journal (Refereed) Published
Abstract [en]

We present a two-dimensional numerical model for the formation of discrete auroral arcs. This model describes the evolution of shear Alfven 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 Alfven 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 mu Am-2. We also find that the electrostatic potential drop is proportional to the square of the current density.

Place, publisher, year, edition, pages
2000. Vol. 105, no A11, 25333-25344 p.
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:umu:diva-85979DOI: 10.1029/2000JA900103OAI: oai:DiVA.org:umu-85979DiVA: diva2:696394
Available from: 2014-02-13 Created: 2014-02-13 Last updated: 2017-12-06Bibliographically approved

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Rönnmark, KjellHamrin, Maria

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