X-ray, H-alpha and radio observational study of the 4N/X2.3 flare of 1981 April 1

Details X-ray, H-alpha and radio observational study of the 4N/X2.3 flare of 1981 April 1 X-ray, H-alpha and radio observational study of the 4N/X2.3 flare of 1981 April 1

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986acaps...6...26w&link_type=abstract

(Acta Astrophysica Sinica, vol. 6, no. 1, 1986, p. 26-34) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol. 10, June 198

Astronomy and Astrophysics

Astrophysics

H Alpha Line, Radio Spectra, Solar Flares, Stellar Spectrophotometry, Visible Spectrum, X Ray Spectra, Magnetic Field Configurations, Magnetic Flux, Spectral Energy Distribution, Spectrum Analysis, Sunspots

Scientific paper

A comprehensive description is given of the large 4N/X2.3 flare of April 1, 1981 on the basis of observed data in the X-ray, optical (H-alpha and white-light), and radio-ranges. The analysis shows the following: the disappearance and contraction of the bright bridges of the large sunspots (as a manifestation of changes in magnetic flux or an EMF), the disappearance and reappearance of sunspots, and the motion of the small sunspots could be the direct cause of this burst. The increase in the curvature of the dark filament before the flare indicated a compression of the magnetic field or an increase in the shear. The soft and hard X-ray burst sources and the microwave source were located on the top of the magnetic loop. The nonthermal electrons with energies above 20 keV provided an energy of about 4.3 (+31) ergs within the first burst peak.

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