Abstract
Using a 1995–2000 data set of vector magnetograms from the Huairou Solar Observing Station(HSOS) of National Astronomical Observatory, the magnetic shear angles of 311 active regions(908 vector magnetograms) were calculated. It is found that the statistical distribution of the magnetic shear angles can be fitted well by Gaussian curves. The chirality of the solar magnetic fields was analyzed using the fitted distribution. The dominant chirality (the sign of the magnetic shear angles) was varied from 1995 to 2000.
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