Dynamics of flare sprays

Autor: Richard T. Hansen, Sara F. Martin, Einar Tandberg-Hanssen
Rok vydání: 1980
Předmět:
Zdroj: Solar Physics. 65:357-368
ISSN: 1573-093X
0038-0938
DOI: 10.1007/bf00152799
Popis: During solar cycle No. 20 new insight into the flare-spray phenomenon has been attained due to several innovations in solar optical-observing techniques (higher spatial resolution cinema-photography, tunable passband filters, multislit spectroscopy and extended angular field coronagraphs). From combined analysis of 13 well-observed sprays which occurred between 1969-1974 it is concluded that (1) the spray material originates from a preexisting active region filament which undergoes increased absorption some tens of minutes prior to the abrupt chromospheric brightening at the 'flare-start', and (2) the spray material is confined within a steadily expanding, loop-shaped (presumable magnetically controlled) envelope with part of the materials draining back down along one or both legs of the loop.
Databáze: OpenAIRE
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