The solar flare of 1980 July 14 and the emergent magnetic flux model

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Magnetic Flux, Solar Flares, Solar Magnetic Field, Solar Radio Bursts, Solar X-Rays, Velocity Distribution, Astronomical Photography, H Alpha Line, High Temperature Plasmas

Scientific paper

The class 3B solar flare of July 14, 1980, is characterized on the basis of H-alpha, fine-structure, and S2HG photographs obtained at Yunnan Observatory; SMM X-ray burst data; and 3 and 10-cm radio burst data obtained at Beijing Observatory. The data are summarized and illustrated in graphs and maps. The emergent-magnetic-flux model of Heyverts et al. (1976) is used to make calculations of the total energy released in the flare (10 to the 31st ergs), the characteristic time scale (2000 sec), the mean energy of the nonthermal electrons (16 keV) and their number (2.4 x 10 to the 37th), and the Alfven velocity (4000 km/sec). These estimates are in agreement with the observations and suggest that nonthermal current-sheet electrons and thermal bremsstrahlung of a hot active-region plasma are the sources of the hard and soft X-ray bursts, respectively.

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