Physics
Scientific paper
May 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976rspta.281..427r&link_type=abstract
(Royal Society, Discussion on the Physics of the Solar Atmosphere, London, England, Jan. 14, 15, 1975.) Royal Society (London),
Physics
27
Filtergrams, Magnetic Variations, Solar Activity Effects, Solar Flares, Solar Magnetic Field, Lines Of Force, Magnetic Disturbances, Magnetic Effects, Magnetic Measurement, Photosphere, Solar Protons, Sunspots
Scientific paper
Possible associations between solar flares and photospheric magnetic fields are examined using high-resolution filtergrams and magnetograms. H-alpha photographs and magnetograms are presented which demonstrate an intimate relation between small flares and emergent photospheric fields, regardless of whether the flares appear over sunspots or 'spotless' regions. A sequence of sunspot photographs taken before, during, and after the large proton flare of August 7, 1972, shows that large flares are associated with the development of a strong transverse field parallel to a neutral line that is flanked by flare ribbons. Morphological evidence for an association between flares and magnetic fields is also discussed. It is suggested that emergent sunspots may be triggers which set off the release of magnetic energy stored in the chromosphere, thus giving rise to flares.
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