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Vlasov simulations of parallel potential drops
Umeå University, Faculty of Science and Technology, Department of Physics.
2013 (English)In: Annales Geophysicae, ISSN 0992-7689, E-ISSN 1432-0576, Vol. 31, no 7, 1227-1240 p.Article in journal (Refereed) Published
Abstract [en]

An auroral flux tube is modelled from the magnetospheric equator to the ionosphere using Vlasov simulations. Starting from an initial state, the evolution of the plasma on the flux tube is followed in time. It is found that when applying a voltage between the ends of the flux tube, about two thirds of the potential drop is concentrated in a thin double layer at approximately one Earth radius altitude. The remaining part is situated in an extended region 1-2 Earth radii above the double layer. Waves on the ion timescale develop above the double layer, and they move toward higher altitude at approximately the ion acoustic speed. These waves are seen both in the electric field and as perturbations of the ion and electron distributions, indicative of an instability. Electrons of magnetospheric origin become trapped between the magnetic mirror and the double layer during its formation. At low altitude, waves on electron timescales appear and are seen to be non-uniformly distributed in space. The temporal evolution of the potential profile and the total voltage affect the double layer altitude, which decreases with an increasing field aligned potential drop. A current-voltage relationship is found by running several simulations with different voltages over the system, and it agrees with the Knight relation reasonably well.

Place, publisher, year, edition, pages
2013. Vol. 31, no 7, 1227-1240 p.
Keyword [en]
Magnetospheric physics, auroral phenomena, electric fields, Space plasma physics, numerical simulation studies
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:umu:diva-79920DOI: 10.5194/angeo-31-1227-2013ISI: 000322518500010OAI: oai:DiVA.org:umu-79920DiVA: diva2:645480
Available from: 2013-09-04 Created: 2013-09-04 Last updated: 2017-12-06Bibliographically approved

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