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 ( F x / F p , F y / F p , and F z / F p ) 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 B x / B y / B z 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 B x / B y / B z , respectively. It is found that the forces indicated by F x / F p and F y / F p increase as thresholds/resolutions increase/decrease. While for F z / F p the trends become more complex. For low threshold, when the resolution decrease the trends of F z / F p are similar as those of F x / F p and F y / F p , while for high threshold the trends of F z / F p are different from those of F x / F p and F y / F p . For original resolution, the forces indicated by F y / F p increase as thresholds increase, while for others resolution they decrease as the thresholds increase contrarily.


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    Title :

    A research on the force-freeness of photosphere magnetic field


    Contributors:
    Liu, S. (author) / Hao, J. (author)

    Published in:

    Advances in Space Research ; 55 , 6 ; 1563-1575


    Publication date :

    2015-01-09


    Size :

    13 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English






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