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Title:
H-alpha and hard X-ray development in two-ribbon flares
Authors:
Dwivedi, B. N.; Hudson, H. S.; Kane, S. R.; Svestka, Z.
Affiliation:
AA(California, University, La Jolla, CA; Banaras Hindu University, Varanasi, India), AB(California, University, La Jolla, CA), AC(California, University, Berkeley, CA), AD(California, University, La Jolla, CA; Utrecht, Rijksuniversiteit, Utrecht, Netherlands)
Journal:
Solar Physics (ISSN 0038-0938), vol. 90, Feb. 1984, p. 331-341. (SoPh Homepage)
Publication Date:
02/1984
Category:
Solar Physics
Origin:
STI
NASA/STI Keywords:
H ALPHA LINE, SOLAR FLARES, SOLAR RADIATION, SOLAR X-RAYS, EMISSION SPECTRA, EXTREME ULTRAVIOLET RADIATION
Bibliographic Code:
1984SoPh...90..331D

Abstract

Morphological features of two-ribbon flares have been studied, using simultaneous ISEE-3 hard X-ray records and high-resolution Big Bear H-alpha movies for more than 20 events. Long-lasting and complex hard X-ray bursts are almost invariably found associated with flares of the two-ribbon type. At least three events are found, namely March 31, 1979, April 10, 1980, and July 1, 1980, where the occurrence of individual spikes in hard X-ray radiation coincides with suddenly enhanced H-alpha emission covering the sunspot penumbra. There definitely exist important (greater than or equal to 1 B) two-ribbon flares without significant hard X-ray emission.

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