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Size dependence of solar X-ray flare properties View all abstracts by submitter

Marina Battaglia   Submitted: 2005-05-09 06:35

Non-thermal and thermal parameters of 85 solar flares of GOES class B1 to M6 (background subtracted classes A1 to M6) have been compared to each other. The hard X-ray flux has been measured by RHESSI and a spectral fitting provided flux and spectral index of the non-thermal emission, as well as temperature and emission measure of the thermal emission. The soft X-ray flux was taken from GOES measurements. We find a linear correlation in a double logarithmic plot between the non-thermal flux and the spectral index. The higher the acceleration rate of a flare, the harder the non-thermal electron distribution. The relation is similar to the one found by a comparison of the same parameters from several sub-peaks of a single flare. Thus small flares behave like small subpeaks of large flares. Thermal flare properties such as temperature, emission measure and the soft X-ray flux also correlate with peak non-thermal flux. A large non-thermal peak flux entails an enhancement in both thermal parameters. The relation between spectral index and the non-thermal flux is an intrinsic feature of the particle acceleration process, depending on flare size. This property affects the reported frequency distribution of flare energies.

Authors: Marina Battaglia, Paolo C. Grigis and Arnold O. Benz
Projects: RHESSI

Publication Status: A&A (in press)
Last Modified: 2005-05-09 06:35
Go to main E-Print page  Modulations of broad-band radio continua and X-ray emissions in the large X-ray flare on 03 November 2003  Coronal mass transfer in interbinary loops  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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