Magnetic shear of a large delta sunspot group (NOAA 6659) in June 1991.

Details Magnetic shear of a large delta sunspot group (NOAA 6659) in June 1991. Magnetic shear of a large delta sunspot group (NOAA 6659) in June 1991.

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...297..869z&link_type=abstract

Astronomy and Astrophysics, v.297, p.869

Astronomy and Astrophysics

Astrophysics

14

Sun: Sunspots, Magnetic Field

Scientific paper

In the extraordinarily flare-prolific region of June 1991, NOAA 6659, unusual evolution of the photospheric vector magnetic field was observed inside the large delta group. The large-scale magnetic field of this region sheared and the transverse field rotated clockwise. Some fibril-like magnetic structures with opposite polarities formed in this region. In comparison with the corresponding chromospheric magnetic field and velocity field, the possible configuration of magnetic lines of force in this active region at the low solar atmosphere was inferred. After analysis, the following new observed phenomena are found: (1) Some of the new magnetic flux emerged in large-scale compact magnetic structures of unipolarity. The footpoints of new emerging flux sheared almost along the direction of the transverse components of the field. Some of the subflares were triggered by the new magnetic flux in the delta active region. (2) Due to the strong shear of the large-scale magnetic field in the delta active region, some strong magnetic ropes of opposite polarities were almost parallel to the magnetic inversion line. Some powerful (white light) flares were probably triggered by the interaction of twisted magnetic ropes lying on the inversion line with the large-scale magnetic field.

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