Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...304..541z&link_type=abstract
Astronomy and Astrophysics, v.304, p.541
Astronomy and Astrophysics
Astrophysics
29
Sun: Magnetic Fields, Activity
Scientific paper
The active region (NOAA 7321) was a new emerging flux region in October 1992. A series of photospheric vector magnetograms, chromospheric magnetograms and Dopplergrams of this active region were obtained with a video vector magnetograph at the Huairou Solar Observing Station. The distribution of magnetic polarity in this active region was opposite to that predicted by the Hale-Nicholson rule. The shear of the photospheric magnetic field formed in the emerging process of magnetic flux and was accompanied by flares. In this paper, the distribution of the photospheric longitudinal current in this active region was determined from vector magnetograms resolving the 180deg ambiguity of the transverse field. After analysis, the following results were obtained: (a) The magnetic shear of the transverse magnetic field is caused by the emergence of the magnetic flux of opposite polarity in the active region. (b) The emergence of magnetic flux of opposite polarity connects with the formation of new electric current systems. The rotation of transverse components of the magnetic field around the main magnetic poles is built-up by the emergence of new magnetic flux in the growing active region. (c) After some flares, the shear of the photospheric transverse magnetic field relative to the neutral line also increases, while there is no relaxation of the magnetic field near sites of flares. The kernels of Hβ flares have no immediate relationship with the peaks of the longitudinal electric current in the emerging flux region.
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