The analysis of hard X-ray radiation of flares with occulted footpoints

Details The analysis of hard X-ray radiation of flares with occulted footpoints The analysis of hard X-ray radiation of flares with occulted footpoints

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...366..294t&link_type=abstract

Astronomy and Astrophysics, v.366, p.294-305 (2001)

Astronomy and Astrophysics

Astrophysics

26

Sun: Corona, Flares, X-Rays, Gamma-Rays

Scientific paper

14 behind-the-limb flares with occulted footpoints, well-observed by Yohkoh, have been carefully selected. Such a flare location on the Sun offers a unique possibility to investigate loop-top hard X-ray emission sources separately, without the presence of strong footpoint sources which can disturb the observational characteristics of the loop-top sources during any process of image reconstruction. Hard X-ray radiation in all investigated flares has similar features: (1) smooth light curves with several impulsive spikes, (2) low-energy spectra (mainly below 33 keV) which can expressed in terms of temperatures within the interval of about 20-100 MK. The HXR images show two types of loop-top emission sources: type A, co-spatial with the bright loop-top kernels seen in soft X-rays, and type B, having no distinct counterpart in soft X-rays. Arguments are presented that this classification is more physical than the classification considering impulsive and gradual sources proposed by Masuda (\cite{masuda-phd}), who actually separated two phases of evolution of the same loop-top source. The model of the turbulent flare kernel (Jakimiec \cite{jja}; Jakimiec et al. \cite{jjc}) has been adapted to explain the obtained characteristics of loop-top HXR emission sources of type A.

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