Vertical current and a 3B/X12 flare in a highly sheared active region (NOAA 6659) on June 9, 1991

Details Vertical current and a 3B/X12 flare in a highly sheared active region (NOAA 6659) on June 9, 1991 Vertical current and a 3B/X12 flare in a highly sheared active region (NOAA 6659) on June 9, 1991

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994soph..151..129z&link_type=abstract

Solar Physics, vol. 151, no. 1, p. 129-136

Physics

20

Current Density, Magnetic Signatures, Plasma Currents, Solar Activity, Solar Magnetic Field, Electric Current, H Beta Line, Magnetic Flux, Photosphere, Plasma Interactions

Scientific paper

NOAA active region 6659, during its June 1991 transit across the solar disk, showed highly sheared vector magnetic field structures and produced numerous powerful flares, including five white-light flares. Photospheric vector magnetograms of this active region were obtained at the Huairou Solar Observing Station of the Beijing Astronomical Observatory. After the resolution of the 180 deg ambiguity of the transverse magnetic field and transformation of off-center vector magnetograms to the heliographic plane, we have determined the photospheric vertical current density and discussed the relationship with powerful flares. The following results were obtained: (a) The powerful 3B/X12 flare on June 9, 1991 was triggered by the interaction between the large-scale electric current system and magnetic flux of opposite polarity. (b) The kernels of the powerful H beta flare (sites of the white-light flare) were close to the peaks of the vertical electric current density. (c) Some small-scale structutes of the vertical current relative to the magnetic islands of opposite polarity have not been found. This probably implies that the electric current is not always parallel to the magnetic field in solar active regions.

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