Variations of magnetic fields and electric currents associated with a solar flare

Details Variations of magnetic fields and electric currents associated with a solar flare Variations of magnetic fields and electric currents associated with a solar flare

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993soph..148..133l&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 148, no. 1, p. 133-138

Physics

9

Current Density, Electric Current, Solar Flares, Solar Magnetic Field, Variations, Magnetic Signatures, Magnetohydrodynamic Stability, Photosphere, Solar Atmosphere

Scientific paper

The high-resolution vector magnetograms obtained with the solar telescope magnetograph of the Beijing Astronomical Observatory of the active region AR 4862 on 7 October, 1987, close before and after a solar flare, were used to calculate the electric current densities in the region. Then the relations between the flare and the magnetic fields as well as the electric currents were studied. The results are: (1) the transverse magnetic fields, and hence the longitudinal electric currents in the region before and after the flare, are evidently different, while the longitudinal magnetic fields remain unchanged; (2) this confirms the result obtained previously that the flare kernels coincide with the peaks of longitudinal electric density in active regions; (3) the close relation between the flare kernels and the electric currents indicates that the variations of the transverse magnetic fields and the longitudinal electric currents arise not from the general global evolution of the active region, but from the flare. These results tend to the conclusion that the triggering of a solar flare might be related with the plasma instability caused by the surplus longitudinal electric currents at some local regions in the solar atmosphere.

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