The initial development of solar flares |
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| Authors: | J F Vesecky A J Meadows |
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| Institution: | (1) Astronomy Dept., University of Leicester, Leicester, England |
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| Abstract: | The extent to which the early phases of solar-flare development can be accounted for by a simple high-temperature chromospheric explosion model is investigated without involving a particular energy source. A model is developed in which it is shown that a point explosion in the lower chromosphere can be treated as a virtually instantaneous release of energy throughout a volume of radius R  100 km, which subsequently expands as a classical hydrodynamic blast wave in which R~ t
 ( < 2/3). This model is in substantial agreement with areal growth-rate observations of disk flares. An explanation for the fact that limb-flare observations can imply > 2/3 is suggested by considering the effects of the large atmospheric density gradient in the lower chromosphere on an upward travelling shock wave. |
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