Physics
Scientific paper
Mar 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989soph..121...31a&link_type=abstract
(IAU, Colloquium on Solar and Stellar Flares, 104th, Stanford, CA, Aug. 15-19, 1988) Solar Physics (ISSN 0038-0938), vol. 121, n
Physics
46
Solar Flares, Solar Spectra, X Ray Spectroscopy, Chromosphere, Density Measurement, Solar X-Rays, Spectral Line Width, Temperature Measurement
Scientific paper
The major results reached during solar maximum 1980, with the advent of crystal spectroscopy at high-wavelength resolution in the soft X-ray region from 1 to 8 A, are reviewed. High-resolution spectroscopy of flare emission has offered the possibility to determine directly most of the thermal plasma parameters and to measure the dynamics in the flare region. It has been found that the enhancement in nonthermal broadening observed in soft-X-ray lines early in a flare can be related directly to the primary energy release process. The convective upflows observed during the flare impulsive phase can be associated with chromospheric evaporation, and it can be concluded that this effect plays a dominant role in supplying mass and energy to flaring loops and in the formation of the high-temperature plasma of the thermal phase. The observed 'superhot' component in the thermal flare plasma may be important for understanding the influence of local conditions on the acceleration mechanisms.
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