The ribbon-like hard X-ray emission in a sigmoidal solar active region

Document Type

Article

Publication Date

4-1-2007

Abstract

Solar flare emissions at Ha and EUV/UV wavelengths often appear in the form of two ribbons, and this has been regarded as evidence of a typical configuration of solar magnetic reconnection. However, such a ribbon structure has rarely been observed in hard X-rays (HXRs), although it is expected. We report a ribbon-like HXR source observed with the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) at energies as high as 25-100 keV during the 2005 May 13 flare. For a qualitative understanding of this unusual HXR morphology, we also note that the source active region appeared in a conspicuous sigmoid shape before the eruption and changed to an arcade structure afterward as observed with the Transition Region and Coronal Explorer (TRACE) at 171 Å. We suggest that the ribbon-like HXR structure is associated with the sigmoid-to-arcade transformation during this type of reconnection. © 2007. The American Astronomical Society. All rights reserved.

Identifier

34247218598 (Scopus)

Publication Title

Astrophysical Journal

External Full Text Location

https://doi.org/10.1086/513739

e-ISSN

15384357

ISSN

0004637X

First Page

L127

Last Page

L130

Issue

2 II

Volume

658

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