Magnetic field changes associated with a sub-flare and surge

Details Magnetic field changes associated with a sub-flare and surge Magnetic field changes associated with a sub-flare and surge

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993soph..144..141h&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 144, no. 1, p. 141-153.

Physics

9

Solar Flares, Solar Magnetic Field, Solar Physics, Sunspots, Magnetic Signatures, Polarity

Scientific paper

A sub-flare and surge were observed on June 13, 1990, with the Marshall Space Flight Center vector magnetograph and coaligned H-alpha telescope. This activity occurred at the site of a parasitic polarity near a large, mature sunspot. Analysis of the vector magnetic field showed that while flux emergence and other field changes occurred sporadically throughout a period of four days, the sub-flare and surge only took place after an increase in magnetic shear in the field of the parasitic polarity. This event also provided an example of relaxation of magnetic shear following the flare and surging.

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