Electronic Resource
Springer
Solar physics
6 (1969), S. 80-85
ISSN:
1573-093X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
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 α (α 〈 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 α 〉 2/3 is suggested by considering the effects of the large atmospheric density gradient in the lower chromosphere on an upward travelling shock wave.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00146798
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