Physics
Scientific paper
Apr 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...41..397r&link_type=abstract
Solar Physics, vol. 41, Apr. 1975, p. 397-414.
Physics
57
Far Ultraviolet Radiation, Solar Flares, Solar Magnetic Field, Solar X-Rays, Energy Sources, Filaments, Filtergrams, Force-Free Magnetic Fields, H Alpha Line, Magnetic Effects, Magnetic Field Configurations
Scientific paper
Results are reported for observations and analysis of synoptic data on a 1B flare that occurred on January 19, 1972. The observations include large-scale H-alpha movies of the flare and pre-flare developments, OSO-7 satellite data on soft X-ray and EUV developments, magnetograms, and hard X-ray observations. Theoretical force-free magnetic field configurations are compared with structures seen in the soft X-ray, EUV, and H-alpha images, and the evolution of the flare is described. The energy available for the flare is estimated from the change of magnetic field inferred from the H-alpha filtergrams and from force-free field calculations. It is suggested that the flare originated in a twisted filament where it was compressed by emerging fields, and it is shown that the flare started below the corona and appeared to derive its energy from the magnetic fields in or near the filament.
Nakagawa Yasuhiro
Neupert Werner M.
Rust David Maurice
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