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An exact collisionless equilibrium for the force-free Harris sheet with low plasma beta

Allanson, O., Neukirch, T., Wilson, F. and Troscheit, S. (2015) An exact collisionless equilibrium for the force-free Harris sheet with low plasma beta. Physics of Plasmas, 22 (10). p. 102116. ISSN 1070-664X

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To link to this item DOI: 10.1063/1.4934611

Abstract/Summary

We present a first discussion and analysis of the physical properties of a new exact collisionless equilibrium for a one-dimensional nonlinear force-free magnetic field, namely, the force-free Harris sheet. The solution allows any value of the plasma beta, and crucially below unity, which previous nonlinear force-free collisionless equilibria could not. The distribution function involves infinite series of Hermite polynomials in the canonical momenta, of which the important mathematical properties of convergence and non-negativity have recently been proven. Plots of the distribution function are presented for the plasma beta modestly below unity, and we compare the shape of the distribution function in two of the velocity directions to a Maxwellian distribution.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
ID Code:71988
Publisher:AIP Publishing

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