Chang Liu et al 2007 ApJ 658 L127 doi:10.1086/513739
Chang Liu1, Jeongwoo Lee1, Dale E. Gary1 and Haimin Wang1
Show affiliationsSolar flare emissions at Hα 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.
Issue 2 (2007 April 1)
Received 2006 November 29, accepted for publication 2007 February 12
Published 2007 February 27
Chang Liu et al 2007 ApJ 658 L127
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Chang Liu and Haimin Wang 2009 ApJ 696 L27
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