Evolution of reconnection along an arcade of magnetic loops

Details Evolution of reconnection along an arcade of magnetic loops Evolution of reconnection along an arcade of magnetic loops

2005-04-20

arxiv.org/abs/astro-ph/0504436v1

Astrophys.J. 625 (2005) L143-L146

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, to be published in Astrophysical Journal Letters

Scientific paper

10.1086/431147

RHESSI observations of a solar flare showing continuous motions of double hard X-ray sources interpreted as footpoints of magnetic loops are presented. The temporal evolution shows many distinct emission peaks of duration of some tens of seconds ('elementary flare bursts'). Elementary flare bursts have been interpreted as instabilities or oscillations of the reconnection process leading to an unsteady release of magnetic energy. These interpretations based on two-dimensional concepts cannot explain these observations, showing that the flare elements are displaced in a third dimension along the arcade. Therefore, the observed flare elements are not a modulation of the reconnection process, but originate as this process progresses along an arcade of magnetic loops. Contrary to previous reports, we find no correlation between footpoint motion and hard X-ray flux. This flare apparently contradicts the predictions of the standard translation invariant 2.5D reconnection models.

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