AbstractWe study a solar flare hard X-ray (HXR) source observed by the Reuven Ramaty high energy solar spectroscopic imager (RHESSI) in which the HXR emission is almost entirely in a coronal loop so dense as to be collisionally thick at electron energies up to ∼45−60keV. This contrasts with most events previously reported in which the HXR emission is primarily from the loop footpoints in the collisionally dense chromosphere. In particular, we show that the high loop column densities inferred from the GOES and RHESSI soft X-ray emission measure and the volume of the flare loop are consistent with the coronal thick-target interpretation of the HXR images and spectra. The high column densities observed already at the very beginning of the impulsive phase are explained by chromospheric evaporation during a preflare which, as Nobeyama 17GHz radio images reveal, took place in the same set of nested loops as the main flare.
Evidence for a solar coronal thick-target hard X-ray source observed by RHESSI
Advances in Space Research ; 35 , 10 ; 1683-1689
2005-01-20
7 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Evidence for a solar coronal thick-target hard X-ray source observed by RHESSI
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