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arXiv 1605.00367astro-ph.SR
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与AR 10930年X3 .4级太阳耀斑事件有关的三维日冕磁场变化

Variations of the 3-D coronal magnetic field associated with the X3.4-class solar flare event of AR 10930

Han He, Huaning Wang, Yihua Yan, P. F. Chen, Cheng Fang

摘要:

本文研究了10930活动区X3.4级耀斑的三维日冕磁场变化。日冕磁场数据是从Hinode卫星获得的光球矢量磁图中重建的,并使用我们以前工作中开发的非线性无力场外推法(He等人,2011年)。三维无力因子$α$、三维电流密度和三维磁能密度被用来分析日冕数据。$α$和电流密度的分布揭示了耀斑前具有强负$α$值和强电流密度的显著磁连通性。这种磁连通性沿着主极性反转线延伸,并被发现完全打破后耀斑。磁能密度的分布变化揭示了耀斑前后磁能的重新分布。在建模体积的较低空间中,磁能的增加占主导地位,并且在较高空间中,能量的减少占主导地位。与耀斑爆发成像观测结果的对比表明,磁连通性的破坏位置和能量密度增加最大值的位置与耀斑初始爆发的位置相吻合。我们的结论是,一个拥挤的积极$α$区出现在光球的原因打破的磁连接。提出了耀斑初始爆发的一种设想,即作用在磁连通性破坏点的孤立电流上的洛伦兹力抬升了相关的等离子体,导致初始喷射。

英文摘要:

The variations of the 3-D coronal magnetic fields associated with the X3.4-class flare of active region 10930 are studied in this paper. The coronal magnetic field data are reconstructed from the photospheric vector magnetograms obtained by the Hinode satellite and using the nonlinear force-free field extrapolation method developed in our previous work (He et al., 2011). The 3-D force-free factor $α$, 3-D current density, and 3-D magnetic energy density are employed to analyze the coronal data. The distributions of $α$ and current density reveal a prominent magnetic connectivity with strong negative $α$ values and strong current density before the flare. This magnetic connectivity extends along the main polarity inversion line and is found to be totally broken after the flare. The distribution variation of magnetic energy density reveals the redistribution of magnetic energy before and after the flare. In the lower space of the modeling volume the increase of magnetic energy dominates, and in the higher space the decrease of energy dominates. The comparison with the flare onset imaging observation exhibits that the breaking site of the magnetic connectivity and site with the highest values of energy density increase coincide with the location of flare initial eruption. We conclude that a cramped positive $α$ region appearing in the photosphere causes the breaking of the magnetic connectivity. A scenario for flare initial eruption is proposed in which the Lorentz force acting on the isolated electric current at the magnetic connectivity breaking site lifts the associated plasmas and causes the initial ejection.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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