On the periodicity of oscillatory reconnection

McLaughlin, J. A., Thurgood, J. O. and MacTaggart, D. (2012) On the periodicity of oscillatory reconnection. Astronomy and Astrophysics, 548, A98. (doi: 10.1051/0004-6361/201220234)

101207.pdf - Published Version
Available under License Creative Commons Attribution.


Publisher's URL: http://dx.doi.org/10.1051/0004-6361/201220234


Context. Oscillatory reconnection is a time-dependent magnetic reconnection mechanism that naturally produces periodic outputs from aperiodic drivers. Aims. This paper aims to quantify and measure the periodic nature of oscillatory reconnection for the first time. Methods. We solve the compressible, resistive, nonlinear magnetohydrodynamics (MHD) equations using 2.5D numerical simulations. Results. We identify two distinct periodic regimes: the impulsive and stationary phases. In the impulsive phase, we find the greater the amplitude of the initial velocity driver, the longer the resultant current sheet and the earlier its formation. In the stationary phase, we find that the oscillations are exponentially decaying and for driving amplitudes 6.3−126.2 km s-1, we measure stationary-phase periods in the range 56.3−78.9 s, i.e. these are high frequency (0.01−0.02 Hz) oscillations. In both phases, we find that the greater the amplitude of the initial velocity driver, the shorter the resultant period, but note that different physical processes and periods are associated with both phases. Conclusions. We conclude that the oscillatory reconnection mechanism behaves akin to a damped harmonic oscillator.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Mactaggart, Dr David
Authors: McLaughlin, J. A., Thurgood, J. O., and MacTaggart, D.
College/School:College of Science and Engineering > School of Mathematics and Statistics > Mathematics
Journal Name:Astronomy and Astrophysics
Publisher:EDP Sciences
ISSN (Online):1432-0746
Copyright Holders:Copyright © 2012 The Authors
First Published:First published in Astronomy and Astrophysics 548:A98
Publisher Policy:Reproduced under a Creative Commons License
Related URLs:

University Staff: Request a correction | Enlighten Editors: Update this record