On the periodicity of oscillatory reconnection

J. A. McLaughlin*, J. O. Thurgood, D. MacTaggart

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number98
Number of pages8
JournalAstronomy & Astrophysics
Volume548
DOIs
Publication statusPublished - Dec 2012

Keywords

  • magnetic reconnection
  • magnetohydrodynamics (MHD)
  • waves
  • Sun: corona
  • Sun: magnetic topology
  • Sun: oscillations
  • MAGNETIC NULL POINT
  • FAST MAGNETOACOUSTIC WAVE
  • SOLAR CORONA
  • ALFVEN WAVES
  • PROPAGATING WAVES
  • NEUTRAL POINTS
  • ACTIVE REGIONS
  • FLARE
  • NEIGHBORHOOD
  • HINODE

Fingerprint

Dive into the research topics of 'On the periodicity of oscillatory reconnection'. Together they form a unique fingerprint.

Cite this