论文标题
2017年9月10日，循环顶部地区的热等离子体流和振荡x8.2太阳能耀斑
Hot Plasma Flows and Oscillations in the Loop-top Region During the September 10 2017 X8.2 Solar Flare
论文作者
论文摘要
在这项研究中，我们调查了2017年9月10日x8.2耀斑事件中耀斑循环上方的热等离子体的运动。我们检查了主耀斑街区南部的区域，那里有来自界面区域成像光谱仪（IRIS）的数据，以及HINODE上的极端紫外成像光谱仪（EIS）。我们发现，在IRIS的Fe XXI线和EIS中的FE XXIV线中观察到的最初的蓝移为20-60 km/s，并且这些蓝移的位置在约10分钟的过程中沿拱廊向南移动。虹膜的节奏使我们能够遵循这些流的演变，我们发现在Fe XXIV线中有初始蓝移的每个位置，多普勒速度的振荡速度为〜400 s。我们得出的结论是，这些时期独立于环长度，排除了磁性站立模式为一种可能的机制。来自扩展的欧文山谷太阳阵列（EOVSA）的微波观测表明，在观察到多普勒偏移的区域中存在非热发射，表明存在加速粒子。我们建议流量和振荡是由于重新连接流出引起的磁场的运动引起的。
In this study, we investigate motions in the hot plasma above the flare loops during the 2017 September 10 X8.2 flare event. We examine the region to the south of the main flare arcade, where there is data from the Interface Region Imaging Spectrograph (IRIS), and the Extreme ultraviolet Imaging Spectrometer (EIS) on Hinode. We find that there are initial blue shifts of 20--60 km/s observed in this region in the Fe XXI line in IRIS and the Fe XXIV line in EIS, and that the locations of these blue shifts move southward along the arcade over the course of about 10 min. The cadence of IRIS allows us to follow the evolution of these flows, and we find that at each location where there is an initial blue shift in the Fe XXIV line, there are damped oscillations in the Doppler velocity with periods of ~400 s. We conclude that these periods are independent of loop length, ruling out magnetoacoustic standing modes as a possible mechanism. Microwave observations from the Expanded Owens Valley Solar Array (EOVSA) indicate that there are non-thermal emissions in the region where the Doppler shifts are observed, indicating that accelerated particles are present. We suggest that the flows and oscillations are due to motions of the magnetic field that are caused by reconnection outflows disturbing the loop-top region.
