Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...45..435o&link_type=abstract
Solar Physics, vol. 45, Dec. 1975, p. 435-452.
Astronomy and Astrophysics
Astronomy
8
Chromosphere, Microwave Interferometers, Solar Corona, Solar Flares, Solar Temperature, Solar X-Rays, Radio Astronomy, Solar Electrons, X Ray Astronomy
Scientific paper
Interferometric observations at 17 GHz of several small X-ray flares are presented along with soft X-ray observations of preflare active regions to show that a large mass increase accompanies the formation of an X-ray hot region in the corona. The total amount of energy contained in a hot coronal region is estimated, and a model is proposed in which a significant amount of the hot matter is supplied to the corona from the chromosphere during each flare. According to this model, energy produced by some coronal instability is transported by thermal conduction to the chromosphere, where dense gas is heated and subsequently expands into the corona. It is shown that impulsive heating of the chromosphere by nonthermal electrons cannot be the energy source of this model because the total energy supplied to the hot region during the gradual phase must be much greater than that supplied during the impulsive phase.
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