The Chromospheric Response to the Sunquake Generated by the X9.3 Flare of NOAA 12673
The Chromospheric Response to the Sunquake Generated by the X9.3 Flare of NOAA 12673
复制标题
NOAA 12673 X9.3 耀斑产生的日震色层响应
DOI：
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发表时间：
2019
影响因子：
4.9
通讯作者：
S. Zharkov
中科院分区：
文献类型：
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作者：
S. Quinn;A. Reid;M. Mathioudakis;Christoper R Nelson;S. Krishna Prasad;S. Zharkov
活动区NOAA 12673在2017年9月非常不稳定，产生了许多太阳耀斑，包括太阳周期24中最大的耀斑，2017年9月6日的X9.3耀斑。据报道，这次耀斑沿耀斑带产生了一些地震。我们使用同时和同空日震和磁成像仪（HMI）视线（LOS）和瑞典1米太阳望远镜（SST）观测来显示对这些地震的色球响应的证据。对Ca ii 8542 Å波前谱线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。我们结合HMI和海温数据集创建了时间-距离图，并推导出响应的表观横向速度和加速度。这些速度范围从4.5到29.5 km s−1，恒定加速度为8.6 × 10−3 km s−2。除了重心法，我们还利用NICOLE反演得到了2.4 km s−1 - 3.2 km s−1的LOS速度。两种技术都表明波峰是由向上流动产生的。我们认为这是耀斑引起的地震的第一个色球特征。
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 2017 September 06. It has been reported that this flare produced a number of sunquakes along the flare ribbon. We have used cotemporal and cospatial Helioseismic and Magnetic Imager (HMI) line of sight (LOS) and Swedish 1 m Solar Telescope (SST) observations to show evidence of the chromospheric response to these sunquakes. Analysis of the Ca ii 8542 Å 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 data sets to create time–distance diagrams and derive the apparent transverse velocity and acceleration of the response. These velocities ranged from 4.5 to 29.5 km s−1 with a constant acceleration of 8.6 × 10−3 km s−2. We employed NICOLE inversions, in addition to the center-of-gravity method to derive LOS velocities ranging from 2.4 km s−1–3.2 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.