The Ribbon-Like Hard X-Ray Emission in a Sigmoidal Solar Active Region

Details The Ribbon-Like Hard X-Ray Emission in a Sigmoidal Solar Active Region The Ribbon-Like Hard X-Ray Emission in a Sigmoidal Solar Active Region

2007-02-12

arxiv.org/abs/astro-ph/0702326v1

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures, The Astrophysical Journal Letters, 2007, accepted

Scientific paper

10.1086/513739

Solar flare emissions at Halpha and EUV/UV wavelengths often appear in the form of two ribbons, which has been regarded as evidence for 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 as well. In this letter, 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 A. We suggest that the ribbon-like HXR structure is associated with the sigmoid-to-arcade transformation during this type of reconnection.

Affiliated with

Also associated with

No associations

Rating

The Ribbon-Like Hard X-Ray Emission in a Sigmoidal Solar Active Region does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Ribbon-Like Hard X-Ray Emission in a Sigmoidal Solar Active Region, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Ribbon-Like Hard X-Ray Emission in a Sigmoidal Solar Active Region will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-409118