Relations between concurrent hard X-ray sources in solar flares

Details Relations between concurrent hard X-ray sources in solar flares Relations between concurrent hard X-ray sources in solar flares

2006-06-14

arxiv.org/abs/astro-ph/0606353v1

Astronomy and Astrophysics

Astrophysics

accepted for publication in A&A, 11 pages, 9 figures

Scientific paper

10.1051/0004-6361:20065233

Context: Solar flares release a large fraction of their energy into non-thermal electrons, but it is not clear where and how. Bremsstrahlung X-rays are observed from the corona and chromosphere. Aims: We aim to characterize the acceleration process by the coronal source and its leakage toward the footpoints in the chromosphere. The relations between the sources reflect the geometry and constrict the configuration of the flare. Methods: We studied solar flares of GOES class larger than M1 with three or more hard X-ray sources observed simultaneously in the course of the flare. The events were observed with the X-ray satellite RHESSI from February 2002 until July 2005. We used imaging spectroscopy methods to determine the spectral evolution of each source in each event. The images of all of the five events show two sources visible only at high energies (footpoints) and one source only visible at low energies (coronal or looptop source, in two cases situated over the limb). Results: We find soft-hard-soft behavior in both, coronal source and footpoints. The coronal source is nearly always softer than the footpoints. The footpoint spectra differ significantly only in one event out of five. Conclusions: The observations are consistent with acceleration in the coronal source and an intricate connection between the corona and chromosphere.

Affiliated with

Also associated with

No associations

Rating

Relations between concurrent hard X-ray sources in solar flares 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 Relations between concurrent hard X-ray sources in solar flares, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Relations between concurrent hard X-ray sources in solar flares will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-196381