arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.15014astro-ph.SR
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太阳耀斑环中磁场强度的微波诊断

Microwave diagnostics of magnetic field strengths in solar flaring loops

Rui Zhu, Baolin Tan, Yingna Su, Hui Tian, Yu Xu, Xingyao Chen, Yongliang Song, Guangyu Tan

摘要:

基于回旋同步辐射理论,我们对太阳耀斑环中的磁场强度进行了微波诊断。利用野边山射电日像仪对17和34 GHz的3次耀斑事件进行观测,得到了圆偏振度和微波通量密度谱指数,并据此绘制了耀斑后环的磁场强度图。我们的研究结果表明,磁场强度通常从~800 G附近的环路足点到~100 G在10- 25微米的高度。比较我们的结果与磁场建模使用磁通绳插入方法进行了讨论。我们的研究证明了微波成像观测的潜力,即使只有两个频率,在诊断日冕磁场的耀斑区域。

英文摘要:

We have performed microwave diagnostics of the magnetic field strengths in solar flare loops based on the theory of gyrosynchrotron emission. From Nobeyama Radioheliograph observations of three flare events at 17 and 34 GHz, we obtained the degree of circular polarization and the spectral index of microwave flux density, which were then used to map the magnetic field strengths in post-flare loops. Our results show that the magnetic field strength typically decreases from ~800 G near the loop footpoints to ~100 G at a height of 10--25 Mm. Comparison of our results with magnetic field modeling using a flux rope insertion method is also discussed. Our study demonstrates the potential of microwave imaging observations, even at only two frequencies, in diagnosing the coronal magnetic field of flaring regions.

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