Kliem, B and Karlicky, M and Benz, AO (2000) Solar flare radio pulsations as a signature of dynamic magnetic reconnection. ASTRON ASTROPHYS , 360 (2) 715 - 728.
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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.
|Title:||Solar flare radio pulsations as a signature of dynamic magnetic reconnection|
|Keywords:||sun : radio radiation, sun : flares, sun : corona, plasmas, magnetohydrodynamics (MHD), HARD X-RAY, TEST PARTICLE-ACCELERATION, CURRENT SHEETS, ANOMALOUS RESISTIVITY, NUMERICAL-MODELS, MECHANISM, COMPUTER, PLASMA, EVOLUTION, EMISSION|
|UCL classification:||UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Space and Climate Physics|
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