Generation of quasi-periodic waves and flows in the solar atmosphere by oscillatory reconnection

Details Generation of quasi-periodic waves and flows in the solar atmosphere by oscillatory reconnection Generation of quasi-periodic waves and flows in the solar atmosphere by oscillatory reconnection

2012-03-30

arxiv.org/abs/1203.6846v1

(2012) ApJ, 749, 30

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

10 pages, 8 figures

Scientific paper

10.1088/0004-637X/749/1/30

We investigate the long-term evolution of an initially buoyant magnetic flux tube emerging into a gravitationally-stratified coronal hole environment and report on the resulting oscillations and outflows. We perform 2.5D nonlinear numerical simulations, generalizing the models of McLaughlin et al. (2009) and Murray et al. (2009). We find that the physical mechanism of oscillatory reconnection naturally generates quasi-periodic vertical outflows, with a transverse/swaying aspect. The vertical outflows consist of both a periodic aspect and evidence of a positively-directed flow. The speed of the vertical outflow (20-60 km/s) is comparable to those reported in the observational literature. We also perform a parametric study varying the magnetic strength of the buoyant flux tube and find a range of associated periodicities: 1.75-3.5 min. Thus, the mechanism of oscillatory reconnection may provide a physical explanation to some of the high-speed, quasi-periodic, transverse outflows/jets recently reported by a multitude of authors and instruments.

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