Physics
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990soph..125..333g&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 125, Feb. 1990, p. 333-342. Research supported by the National Natural Science Foundation o
Physics
10
Chromosphere, Solar Flares, X Ray Spectra, Solar Flux Density, Solar X-Rays, Stellar Models
Scientific paper
By comparison between SMM HXRBS observation and ground observation of H-alpha and Ca II K lines for the 2B flare on February 3, 1983, it was found that there was a temporal correlation between H-alpha intensity and hard X-ray flux at the early stage of the impulsive phase while different peaks in the hard X-ray flux curve represented bursts at different locations. When SMM HXRBS observation was combined with chromospheric flare models, it was further found that the temporal coincidence between H-alpha intensity and hard X-ray flux could be explained quantitatively by the fact that the H-alpha flare was indeed due to the heating by nonthermal electron beams responsible for the emission or hard X-rays. The source of electrons seemed to be situated around the top of the flare loop, and the column density at the top of the chromosphere in semiempirical flare models could not be taken as the total material above the top of the chromosphere.
Fang Cheng
Gan Wei-Qun
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