Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991azh....68..384z&link_type=abstract
Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 68, Mar.-Apr. 1991, p. 384-393. In Russian.
Astronomy and Astrophysics
Astronomy
11
Dynamo Theory, Electric Current, Ohmic Dissipation, Solar Flares, Atomic Collisions, Chromosphere, Solar Prominences
Scientific paper
It is shown that the main problems of the dynamo theory of solar flares; namely, the unrealistically great current growth time and the current interruption mechanism, can be solved by assuming the emergence of magnetic loops with current and by the correct application of Ohm's law. A generalized Ohm's law for solar flares is obtained, and prerequisites for flare energy release are proposed. Coalescence of a flare loop and of a filament is considered as an example, and it is shown that the current dissipation increases dramatically as compared with that in completely ionized plasma, providing effective Joule heating of the plasma and particle acceleration in a solar flare. The ion-atom collisions play the decisive role in the energy release process, leading to an 8-10-order-of-magnitude increase in the flare loop resistance. The energy release emerging from the upper part of a flare loop stimulates a powerful energy release in the chromosphere.
Stepanov Alexander V.
Zaitsev Valerii V.
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