Physics
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978soph...58..149t&link_type=abstract
Solar Physics, vol. 58, June 1978, p. 149-163.
Physics
22
Magnetic Measurement, Magnetic Signatures, Magnetic Variations, Solar Flares, Solar Magnetic Field, Data Reduction, Digital Data, Force-Free Magnetic Fields, High Resolution, Lines Of Force, Statistical Analysis, Video Data
Scientific paper
A digital analysis of high-time-resolution videomagnetograms taken during a class 2b flare that occurred at 60 deg east is reported. The data were obtained at the Big Bear Observatory and calibrated by a Mt. Wilson magnetogram. Changes of weak magnetic fields (less than 100 G) with an amplitude of 30% to 100% have been detected over 55% of the optical flare region, apparently taking place at the initial phase of the flare. Statistical considerations suggest a real flare association with most of these changes. H-alpha observations show that large changes took place over the footpoints of heavily inclined structures like penumbral fibrils, while smaller changes took place over the plage region. An apparent polarity reversal was found at the feet of erupted fibrils. Based on force-free field calculations these changes can be reasonably explained as a transformation of the current-carrying fields to potential fields which produced large changes in the field-line inclination and rotation.
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