The flares of April 1980 - A case for flares caused by interacting field structures

Details The flares of April 1980 - A case for flares caused by interacting field structures The flares of April 1980 - A case for flares caused by interacting field structures

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...85..157m&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 85, May 1983, p. 157-184. Research supported by the Ministry of Education and Science of Ne

Physics

53

Solar Flares, Solar Magnetic Field, Solar Spectra, Solar X-Rays, Astronomical Models, Current Sheets, Emission Spectra, H Alpha Line, Plasma Dynamics

Scientific paper

The authors discuss the spatial and temporal chracteristics of X-ray flares occurring in the active region NOAA 2372 from April 6 to 13, 1980. The flares are seen to extend in most cases across the whole active complex, involving several magnetic features. They originate in an intermediate bipole, between the two main sunspots of the active region, where high magnetic shear was detected. A rapid expansion is seen in some cases, in conjunction with the start of the impulsive hard X-ray bursts. The authors also detect a large soft X-ray structure overlying the whole active region, which also shows up as a noise storm region at metric wavelengths. These large loops cool by heat conduction but, in some cases, Hα condensations seem to appear, probably as a result of magnetic compression and a condensation mode of the thermal instability. The topological aspects of the field configuration are discussed, in the context of flare models invoking magnetic reconnection at the site of the primary energy release.

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