Abstract Light bridge (LB) is bright structure crossing the umbra of sunspots and associated to the breakup or assembly of sunspots. In this paper, a LB is presented and studied using the observatory data obtained by Hinode satellites. Force-free factor () and the z-component of current () and tension force () are calculated basing on the vector magnetograms observed by Spectro-Polarimeter (SP) of the Solar Optical Telescope (SOT) on board Hinode. It is found that the amplitudes of and of LB are generally larger than those of umbra. It is found that there are two signs of along LB, which are divided at near the middle position of LB. It is found that the amplitudes of of LB are smaller than those of umbra and there are changes of sign of between the boundary of LB and umbra. Through comparisons and investigations, it suggest that LB and umbra maybe two different magnetic systems, which is a necessary condition for interaction magnetic reconnection.
Fine magnetic characteristics of a light bridge observed by Hinode
Advances in Space Research ; 55 , 12 ; 2931-2939
2015-02-26
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Fine magnetic characteristics of a light bridge observed by Hinode
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