Physics
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988soph..117...57y&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 117, no. 1, 1988, p. 57-67. Research supported by the High Altitude Observatory and Nationa
Physics
7
Force-Free Magnetic Fields, Magnetic Flux, Solar Flares, Solar Magnetic Field, Sunspots
Scientific paper
The theory of Yang, Chang, and Harvey (1983) is used to perform an analysis of the big active region AR 4711 of February, 1986, which produced many big and strong flares with proton events, SIDs and other significant geophysical effects. The various physical quantities are calculated, yielding for ΔM a value up to 5.36×1032erg, sufficient to supply the energies of the observed flare activities in this active region. Observations agree with the theoretical expectations. It is found that the maximum of the f number of flare activity occurred about one day later than the maximum of ΔM, i.e., the release of free magnetic energy to produce flare activity requires a time interval of about one day. This, together with the formula of ΔM can be useful in solar prediction work. The separation of both footpoints of the new emerging magnetic flux along the neutral line of the old bipolar group led to the formation of a compact quadrupolar sunspot group, with strong twisting of penumbral filaments.
Ding Yujie J.
Hong Qin-Fang
Yang Hai-Shou
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