Physics
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982soph...77...43l&link_type=abstract
Solar Physics, vol. 77, Apr. 1982, p.43-61.
Physics
63
Force-Free Magnetic Fields, Magnetic Field Configurations, Magnetic Flux, Polarity, Solar Flares, Solar Magnetic Field, Mathematical Models, Photosphere, Potential Fields
Scientific paper
A theoretical relationship is provided between different magnetic field features that have been identified separately by observation to indicate likely flare sites. In terms of sequences of exact force-free fields, it is shown by direct illustration how the global topology of the polarity reversal of a pair of spots implies local geometries of highly sheared, low lying loops in the vicinity where the photospheric transverse field aligns with the neutral line. The formation of these sites is accompanied by the creation of magnetic free energy. The model also shows that, as the field evolves, flux may emerge or disappear through the photosphere at these highly stressed locations. It is suggested that flux may occasionally disappear below the photosphere at the neutral line, leading to flare eruptions, and that the geometry of low-lying loops at a potential flare site is conducive to the formation of a dark filament.
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