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Solar flare radio pulsations as a signature of dynamic magnetic reconnection View all abstracts by submitter

Bernhard Kliem   Submitted: 2000-06-22 21:04

Decimetric radio observations of the impulsive solar flare on October 5, 1992, 09: 25 UT show a long series of quasi-periodic pulsations deeply modulating a continuum in the 0.6-2 GHz range that is slowly drifting toward lower frequencies. We propose a model in which the pulsations of the radio flux are caused by quasi-periodic particle acceleration episodes that result from a dynamic phase of magnetic reconnection in a large-scale current sheet. The reconnection is dominated by repeated formation and subsequent coalescence of magnetic islands (known as ``secondary tearing'' or ``impulsive bursty'' regime of reconnection), while a continuously growing plasmoid is fed by newly coalescing islands. Such a model, involving a current sheet and a growing plasmoid, is consistent with the Yohkoh observations of the same flare (Ohyama & Shibata 1998). We present two-dimensional MHD simulations of dynamic magnetic reconnection that support the model. Within the framework of the proposed interpretation, the radio observations reveal details of plasmoid formation in flares.

Authors: Kliem, B., Karlický, M., Benz, A. O.

Publication Status: A&A (in press)
Last Modified: 2000-06-22 21:04
Go to main E-Print page  Observation and analysis of a 3B/X3 solar flare
  Three-dimensional spontaneous magnetic reconnection in neutral current sheets
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