Regions of primary energy release of solar flares associated with singularities in the magnetic field |
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| Authors: | O G Den I V Zimovets |
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| Institution: | 1.Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation,Russian Academy of Sciences, IZMIRAN,Troitsk, Moscow Region,Russia;2.Space Research Institute,Russian Academy of Sciences,Moscow,Russia |
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| Abstract: | The locations of sites of primary energy release of solar flares are studied. Magnetic singularities revealed earlier—self-intersections
(reconnections) of F = 0 surfaces, where F is a differential factor determining the structural singularity in a potential magnetic field—are considered as possible
sites of energy release. Six flare events demonstrating paired sources of non-thermal hard X-rays emission observed on March
17, 2002, July 17, 2002, April 6, 2004, November 4, 2004, November 6, 2004, and December 1, 2004 are analyzed for probable
singularities. In each event analyzed, each source of non-thermal hard X-rays emission can be associated with an individual
magnetic singularity; in other words, there is a magnetic-field line passing near the singularity and ending near (i.e. within
about 10″) the source located on the photosphere (in the chromosphere). For the homologous flares observed on November 4 and
6, 2004, the same magnetic singularity is responsible for the source of non-thermal hard X-rays emission observed in the eastern
sector of the flare region on November 4 and the source observed in the western part on November 6. A proposed interpretation
associates these observations with a reversal of the electric field generated in the magnetic singularity on November 6, compared
with the electric field generated on November 4, attributed to corresponding changes occurring in the photospheric magnetic
field. |
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