Physical Aspects of the Prediction of Solar Flares,
STANFORD UNIV CA CENTER FOR SPACE SCIENCE AND ASTROPHYSICS
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The properties of a solar flare depend critically on the preflare magnetic-field configuration and the way that this configuration evolves during the flare process. The flare process often, if not always, involves the eruption of a filament or similar structure, possibly leading to complete ejection from the sun. This eruption will generate an extensive current sheet reconnection of this sheet contributes to the gradual phase and perhaps also to the impulsive phase. It is proposed that reconnection of a current sheet pre-existing, or generated by filament eruption is required for a gamma-ray event or a particle event. A particle event requires also an escape mechanism that could be provided either by a pre-existing open current sheet or by the ejection of the magnetic-field configuration associated with a filament. Following these guidelines, it is possible to propose a classification of flares into seven categories and to propose whether or not each category will lead to the following phenomena mass ejection, shock wave, gamma-ray emission, and particle event.