Lyubarsky 2010 Kruskal-Schwarzschild不稳定性作为Poynting流的耗散机制

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Title:		A New Mechanism for Dissipation of Alternating Fields in Poynting-dominated Outflows
Authors:		Lyubarsky, Yuri
Publication:		The Astrophysical Journal Letters, Volume 725, Issue 2, pp. L234-L238 (2010). (ApJL Homepage)
Publication Date:		12/2010
Origin:		IOP
ApJ Keywords:		galaxies: jets, gamma-ray burst: general, instabilities, magnetic reconnection, magnetohydrodynamics: MHD, relativity
DOI:		10.1088/2041-8205/725/2/L234
Bibliographic Code:		2010ApJ...725L.234L

Abstract

Reconnection of alternating magnetic fields is an important energy transformation mechanism in Poynting-dominated outflows. We show that the reconnection is facilitated by the Kruskal-Schwarzschild instability of current sheets separating the oppositely directed fields. This instability, which is a magnetic counterpart of the Rayleigh-Taylor instability, develops if the flow is accelerated. Then the plasma drips out of the current sheet, providing conditions for rapid reconnection. Since the magnetic dissipation leads to the flow acceleration, the process is self-sustaining. In pulsar winds, this process could barely compete with the earlier proposed dissipation mechanisms. However, the novel mechanism turns out to be very efficient at active galactic nucleus and gamma-ray burst conditions.

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