Relativistic magnetic reconnection at X-type neutral points

Details Relativistic magnetic reconnection at X-type neutral points Relativistic magnetic reconnection at X-type neutral points

2011-04-06

arxiv.org/abs/1104.1003v1

A&A 531 (2011) A47

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

6 pages, 4 figures

Scientific paper

10.1051/0004-6361/201116562

Relativistic effects in the oscillatory damping of magnetic disturbances near two-dimensional X-points are investigated. By taking into account displacement current, we study new features of extremely magnetized systems, in which the Alfv\'en velocity is almost the speed of light. The frequencies of the least-damped mode are calculated using linearized relativistic MHD equations for wide ranges of the Lundquist number S and the magnetization parameter $\sigma$. These timescales approach constant values in the large resistive limit: the oscillation time becomes a few times the light crossing time, irrespective of $\sigma$, and the decay time is proportional to $\sigma$ and therefore is longer for a highly magnetized system.

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