Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.0805s&link_type=abstract
American Astronomical Society, SPD meeting #37, #8.05; Bulletin of the American Astronomical Society, Vol. 38, p.231
Astronomy and Astrophysics
Astronomy
Scientific paper
We study the retraction of thin flux tubes after reconnection. During reconnection, magnetic field lines, initially oriented in different directions and separated by a current sheet, are broken and reconnected. This process releases a large amount of magnetic energy that accelerates the fluid particles in, for example, Coronal Mass Ejections. A new model, describing the effect on the global field, of reconnection occurring within a small region of a pre-existing current sheet of uniform strength, has been recently proposed by Linton and Longcope (2006). This model is called patchy reconnection. Their prototype calculation used a flat current sheet with uniform-surface-current density. We generalize this approach using a Y-type current sheet whose current density increases away from the Y-point. We solve analytically and numerically thin flux tube equations for dynamics of thin post-reconnection flux tubes. Two types of retracting flux tubes are possible in this geometry: outward (U-shaped) tubes moving away from the tip of the sheet at increasing speed, and inward (Omega-shaped) tubes moving toward the tip at decreasing speed. We present, theoretically and via simulations, time-dependent solutions for both types of flux tubes.This work is supported by the National Science Foundation under Grant ATM 04-16340.
Longcope Dana
Silvina Guidoni E.
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