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arXiv 1906.08545astro-ph.SR
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NOAA 12673的X9.3级耀斑日震的色球响应

The Chromospheric Response to the Sunquake generated by the X9.3 Flare of NOAA 12673

Sean Quinn, Aaron Reid, Mihalis Mathioudakis, Christopher Nelson, S. Krishna Prasad, Sergei Zharkov

摘要:

活动区域NOAA 12673在2017年9月极度不稳定,产生了许多太阳耀斑,包括2017年9月6日太阳活动周期24中最大的X9.3耀斑。据报道,这次耀斑沿着耀斑带产生了一些太阳地震(Sharykin & Zhao vichev 2018; Zhao & Chen 2018)。我们已经使用了同时间和同空间的日震和磁成像仪(HMI)的视线(LOS)和瑞典1米太阳望远镜观测显示这些太阳地震的色球层响应的证据。对Ca II 8542的\space谱线波前轮廓的分析表明,波峰产生强烈的蓝色不对称,而波谷最多产生非常轻微的红色不对称。我们使用组合HMI,SST数据集创建时间-距离图,并推导出响应的视横向速度和加速度。这些速度范围从4.5 km s $^{-1}$到29.5 km s $^{-1}$,恒定加速度为8.6 x 10 $^{-3}$ km s $^{-2}$。除了重心(COG)方法外,我们还采用了NICOLE反演方法来推导2.4 km s $^{-1}$至3.2 km s $^{-1}$的LOS速度。这两种技术都表明,波峰是由上升流造成的。我们相信这是耀斑引起的第一个色球层信号。

英文摘要:

Active region NOAA 12673 was extremely volatile in 2017 September, producing many solar flares, including the largest of solar cycle 24, an X9.3 flare of 06 September 2017. It has been reported that this flare produced a number of sunquakes along the flare ribbon (Sharykin & Kosovichev 2018; Zhao & Chen 2018). We have used co-temporal and co-spatial Helioseismic and Magnetic Imager (HMI) line-of-sight (LOS) and Swedish 1-m Solar Telescope observations to show evidence of the chromospheric response to these sunquakes. Analysis of the Ca II 8542 Å\space line profiles of the wavefronts revealed that the crests produced a strong blue asymmetry, whereas the troughs produced at most a very slight red asymmetry. We used the combined HMI, SST datasets to create time-distance diagrams and derive the apparent transverse velocity and acceleration of the response. These velocities ranged from 4.5 km s$^{-1}$ to 29.5 km s$^{-1}$ with a constant acceleration of 8.6 x 10$^{-3}$ km s$^{-2}$. We employed NICOLE inversions, in addition to the Center-of-Gravity (COG) method to derive LOS velocities ranging 2.4 km s$^{-1}$ to 3.2 km s$^{-1}$. Both techniques show that the crests are created by upflows. We believe that this is the first chromospheric signature of a flare induced sunquake.

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