A Research on the Force-Freeness of Photosphere Magnetic Field

S. Liu; J. Hao

doi:10.1016/j.asr.2015.01.010

paper

A Research on the Force-Freeness of Photosphere Magnetic Field

arXiv:1902.00308 · doi:10.1016/j.asr.2015.01.010

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.

25Pages

A Research on the Force-Freeness of Photosphere Magnetic Field

Abstract

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