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The dispersive Alfven wave in the time-stationary limit with a focus on collisional and warm-plasma effects
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.
2008 (English)In: Physics of Plasmas, ISSN 1070-664X, Vol. 15, no 5, 052108- p.Article in journal (Refereed) Published
Abstract [en]

A nonlinear, collisional, two-fluid model of uniform plasma convection across a field-aligned current (FAC) sheet, describing the stationary Alfven (StA) wave, is presented. In a previous work, Knudsen showed that, for cold, collisionless plasma [D. J. Knudsen, J. Geophys. Res. 101, 10761 (1996)], the stationary inertial Alfven (StIA) wave can accelerate electrons parallel to a background magnetic field and cause large, time-independent plasma-density variations having spatial periodicity in the direction of the convective flow over a broad range of spatial scales and energies. Knudsen suggested that these fundamental properties of the StIA wave may play a role in the formation of discrete auroral arcs. Here, Knudsen's model has been generalized for warm, collisional plasma. From this generalization, it is shown that nonzero ion-neutral and electron-ion collisional resistivity significantly alters the perpendicular ac and dc structure of magnetic-field-aligned electron drift, and can either dissipate or enhance the field-aligned electron energy depending on the initial value of field-aligned electron drift velocity. It is also shown that nonzero values of plasma pressure increase the dominant Fourier component of perpendicular wavenumber.

Place, publisher, year, edition, pages
2008. Vol. 15, no 5, 052108- p.
National Category
Fusion, Plasma and Space Physics
URN: urn:nbn:se:kth:diva-33354DOI: 10.1063/1.2890774ISI: 000256305200011ScopusID: 2-s2.0-44649097521OAI: diva2:414666
QC 20110504Available from: 2011-05-04 Created: 2011-05-04 Last updated: 2011-05-04Bibliographically approved

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