Levinson, Amir 2009 对流不稳定性可能是激波磁场的来源

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Title:		Convective Instability of a Relativistic Ejecta Decelerated by a Surrounding Medium: An Origin of Magnetic Fields in GRBs?
Authors:		Levinson, Amir
Publication:		eprint arXiv:0906.4483
Publication Date:		06/2009
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		8 pages 1 fig. A detailed paper will follow
Bibliographic Code:		2009arXiv0906.4483L

Abstract

Global linear stability analysis of a self-similar solution describing a relativistic shell decelerated by an ambient medium is performed. The system is shown to be subject to the convective Rayleigh-Taylor instability, with a rapid growth of eigenmodes having angular scale much smaller than the causality scale. The growth rate appears to be largest at the interface separating the shocked ejecta and shocked ambient gas. The disturbances produced at the contact interface propagate in the shocked media and cause nonlinear oscillations of the forward and reverse shock fronts. It is speculated that such oscillations may affect the emission from the shocked ejecta in the early afterglow phase of GRBs, and may be the origin of the magnetic field in the shocked circum-burst medium.

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