Statistics Of Solar Flares Hard X-ray Spectra Using RHESSI.

Details Statistics Of Solar Flares Hard X-ray Spectra Using RHESSI. Statistics Of Solar Flares Hard X-ray Spectra Using RHESSI.

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21640437a&link_type=abstract

American Astronomical Society, AAS Meeting #216, #404.37

Astronomy and Astrophysics

Astronomy

Scientific paper

Non-thermal X-ray emission provides a key diagnostic on particle acceleration and transport during solar flares. Thermal and non-thermal emissions can be derived from the spatially integrated photon flux spectrum obtained by the Ramaty High Energy Solar Spectroscopic Imager (RHESSI). The thermal radiation is usually represented by a maxwellian and the non-thermal emission is represented by a single or a double (broken) power-law. We present spectral characteristics of 65 flares observed by RHESSI and having emission to at least 150keV above the background level. The spectra are integrated over 8s at the hard x-ray peak time. Our major findings are as follows: (1)The spectra almost always break downwards i.e. the spectral indices above the breakenergy are greater than indices below the break energy (47/65). (2) The break energy is typically around 60 keV (3) There is no dependence of the break energy upon the spectral index. (4) A small dependence of the photon flux upon the break energy.

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