On Integrated Hard X-Ray Broken-Up Spectra of Solar Flares

Details On Integrated Hard X-Ray Broken-Up Spectra of Solar Flares On Integrated Hard X-Ray Broken-Up Spectra of Solar Flares

Mar 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011soph..269...59l&link_type=abstract

Solar Physics, Volume 269, Issue 1, pp.59-66

Physics

5

Flares, Spectrum, Spectrum, X-Ray, X-Ray Bursts, Hard

Scientific paper

The summation of two single power-law spectra with a rather big difference of the spectral indices and with comparable intensities looks like a broken-up spectrum. The spatially integrated hard X-rays contain contributions from different sources, like footpoint and looptop sources. Within the standard scenario of solar flares, the power-law index difference between the footpoints and looptop should be two. Taking the M7.6 flare on 24 October 2003 as an example, we showed that the hard X-ray spectrum itself for footpoints and looptop is a single power-law, but the spatially integrated spectrum presents a broken-up form. It is also shown that the time-integrated spectrum could present a broken-up form, although the spectrum in further refined intervals presents a single power-law. It is concluded that the integrated broken-up spectrum observed here is produced either by the summation of individual sources or by the temporal variation of a single source, not by the acceleration itself.

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