期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 725, 期 2, 页码 L234-L238出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/725/2/L234
关键词
galaxies: jets; gamma-ray burst: general; instabilities; magnetic reconnection; magnetohydrodynamics (MHD); relativity
资金
- US-Israeli Binational Science Foundation [2006170]
- Israeli Science Foundation [737/07]
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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