Sunspots of the Large Active Region 8210 and Evolution of the Magnetic Field

The magnetic structure of the active region 8210 was reversely polarized.At the beginning the main sunspot with negative polarity was surrounded at upper part by one with positive polarity,then the magnetic field with positive polarity emerged at the lower part and brought on a clockwise rotation of the main sunspot being about 90°.The main sunspot slightly rotated in the counterclockwise direction while the magnetic field with positive polarity reduced.The high-energetic-flare burst produced in the region was closely related to the changes of the magnetic field.