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Forced reconnexion by fast magnetosonic waves in a current sheet with stagnation-point flows

Published online by Cambridge University Press:  13 March 2009

Jun-Ichi Sakai
Jun-Ichi Sakai
Affiliation:
Department of Applied Mathematics and Physics, Faculty of Engineering, Toyama University, Takaoka, Toyama, 933Japan
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Abstract

Forced reconnexion due to tearing modes driven by fast magnetosonic waves in a current sheet with stagnation-point flows is discussed. The current sheet with stagnation-point flows which is weakly unstable against tearing modes can be strongly destabilized by vortex motions due to the ponderomotive force of the fast magnetosonic wave. This forced tearing instability can be driven when the incident fast magnetosonic wave intensity, I, exceeds a critical value given by where is the Alfvén velocity, vg the group velocity of the fast wave, vo the background inflow velocity, l the thickness of the current sheet and k the wavenumber of the forced tearing mode. The growth rate is estimated. Applications to solar flares and magnetopause reconnexion processes are briefly discussed.

Type
Research Article
Information
Journal of Plasma Physics , Volume 30 , Issue 1 , August 1983 , pp. 109 - 124
Copyright
Copyright © Cambridge University Press 1983

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