H-alpha and hard X-ray development in two-ribbon flares

Details H-alpha and hard X-ray development in two-ribbon flares H-alpha and hard X-ray development in two-ribbon flares

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...90..331d&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 90, Feb. 1984, p. 331-341.

Physics

20

H Alpha Line, Solar Flares, Solar Radiation, Solar X-Rays, Emission Spectra, Extreme Ultraviolet Radiation

Scientific paper

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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