A Morphological Study of Magnetic Shear Development in a Flare-Productive Region NOAA 7270

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Scientific paper

The evolutional changes of a flare-productive region NOAA 7270 were examined in details with high resolution H_alpha images, magnetograms and soft X-ray images to study the process of the magnetic shear development and its relation to the strong flare activity of the region. This study led us to the following results and a conclusion:(1) Several new bipolar pairs simultaneously and or successively emerged in NOAA 7270 from 5 through 7 September. (2) Magnetic shear configurations developed at three locations, where most of flares occurred from 5 through 7 , September. (3)These magnetic shear configurations were formed by successive emergences of twisted magnetic ropes from below the photosphere.

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