Physics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991soph..134..329s&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 134, Aug. 1991, p. 329-352.
Physics
45
Coalescing, Plasma Currents, Solar Flares, Gamma Rays, Mathematical Models, Plasma Heating, Shock Waves, Solar Magnetic Field, Solar Oscillations
Scientific paper
A new model for high-energy solar flare explosions driven by 3D X-type current loop coalescence is presented. This process is studied by a first-order approach of the relevant variables near the point of coalescence. It is shown that, following a strong plasma collapse due to the pinch effect, a point-like plasma explosion can be driven while fast magnetosonic shock waves can also be excited. It was found that the conditions in the area producing the remarkable flare bursts of May 21, 1984, were such that the many flare spikes were due to 3D explosive X-type current loop coalescence. The conditions of shock formation in a gamma ray flare are studied in order to show that the time delay of gamma-rays from the impulsive phase is the time needed for the shock formation in the flaring region. Conclusions are drawn as to why certain flares emit gamma-rays in the MeV energy range and why other, apparently important and energetic, flares do not.
de Jager Cornelis
Sakai Jun-Ichi
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