Quantitative analysis of hard X-ray 'footpoint' flares observed by the solar maximum mission

Details Quantitative analysis of hard X-ray 'footpoint' flares observed by the solar maximum mission Quantitative analysis of hard X-ray 'footpoint' flares observed by the solar maximum mission

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985soph...99..231m&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 99, Sept. 1985, p. 231-262. SERC-NSF-NASA-supported research.

Physics

41

Solar Flares, Solar Instruments, Solar Maximum Mission, Solar X-Rays, X Ray Imagery, Collimators, Contrast, Correction, Image Analysis, Particle Acceleration, Solar Spectra, Thermal Emission

Scientific paper

The authors describe the instrumental corrections which have to be incorporated for reliable correction and deconvolution of images obtained in the 16 - 22 keV and 22 - 30 keV energy bands of the Hard X-ray Imaging Spectrometer (HXIS) aboard the Solar Maximum Mission (SMM). Next the authors discuss the results of application of their routine to the three impulsive flare phases reported by Duijveman et al. (1982) as exhibiting hard X-ray "footpoints", namely 1980, April 10, May 21, and November 5. Next are considered the implications of these results for models of the footpoint emission. The authors also reconsider the constraints placed on the acceleration site conditions in a beam interpretation by return current stability and footpoint contrast in the summed 16 - 30 keV range. Using the smoothed maximum entropy contrast and taking explicit account of coronal thermal emission, they find maximum densities somewhat larger than Duijveman et al. estimated, and much higher maximum values of Te/Ti.

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