Abstract In this paper, the statistical studies on the force-freeness of photosphere magnetic fields are given. The studies are based on the vector magnetic fields observed by Solar Optical Telescope/Spectro-Polarimeter (SOT/SP) on board Hinode. Three parameters (, and ) are introduced to investigate the force-freeness of active regions photosphere magnetic field. Various thresholds and reductions of original resolutions are selected to calculated parameters. As for the resolutions, the reductions of original resolution data by a factor of 2, 4 and 8 are applied. While for thresholds, they are calculated from individual active region with the average of 75/77/57 G for // for all original data. When the resolution are reduced by 2, 4 and 8, the corresponding averages are 72/75/55, 66/68/49 and 57/59/41 G for //, respectively. It is found that the forces indicated by and increase as thresholds/resolutions increase/decrease. While for the trends become more complex. For low threshold, when the resolution decrease the trends of are similar as those of and , while for high threshold the trends of are different from those of and . For original resolution, the forces indicated by increase as thresholds increase, while for others resolution they decrease as the thresholds increase contrarily.
A research on the force-freeness of photosphere magnetic field
Advances in Space Research ; 55 , 6 ; 1563-1575
2015-01-09
13 pages
Article (Journal)
Electronic Resource
English
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