Volume 548, December 2012
|Number of page(s)||8|
|Published online||29 November 2012|
On the periodicity of oscillatory reconnection
School of Computing, Engineering & Information Sciences,
Newcastle Upon Tyne,
2 School of Engineering, Computing & Applied Mathematics, University of Abertay, Dundee, DD1 1HG, UK
Accepted: 31 October 2012
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.
Key words: magnetic reconnection / magnetohydrodynamics (MHD) / waves / Sun: corona / Sun: magnetic topology / Sun: oscillations
© ESO, 2012
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.