论文标题
与CME后电流相关的浆液统计研究
Statistical Study of Plasmoids associated with post-CME Current Sheet
论文作者
论文摘要
我们研究了在X-8.3耀斑之后形成的当前纸中观察到的浆液的性质，然后使用极端紫外线（EUV）和白光冠状图像在2017年9月10日进行快速CME喷发。主要目的是使用现有的地面和空间仪器来了解不同时空尺度上浆体的演变。我们在{\ IT大气成像组装}（AIA）和白光冠状动脉（K-COR和LASCO/C2的连续图像）中观察到的当前纸中的浆液中鉴定了浆样。我们发现当前的纸张伴随着几个浆体向上和向下移动。我们的分析表明，在AIA视图（FOV）中，向下和向上移动的浆液的平均宽度分别为5.92 mm和5.65 mm。但是，在K-COR中，向上移动的浆液的平均宽度为64 mm，在LASCO/C2 FOV中的平均宽度为510 mm。在跟踪连续图像中的浆样后，我们观察到向下和向上移动的浆液的平均速度为$ \ sim $ 272 km s $^{ - 1} $和$ \ sim $ 191 $ 191 km S $^{ - 1} $在EUV Passband中。我们注意到，浆液在Lasco FOV到达时会变成超级alfvénic。此外，我们估计当前表的零点在$ \ $ \ $ \ $ 1.15 r $ _ \ odot $中观察到双向浆液运动。我们研究了形成的浆液的宽度分布，并注意到它由功率指数为-1.12的功率定律管辖。与以前的研究不同，小规模浆液的趋势没有差异。中性点附近加速浆液的存在表明MHD模型预测的扩散区域更长。
We investigate the properties of plasmoids observed in the current sheet formed after an X-8.3 flare followed by a fast CME eruption on September 10, 2017 using Extreme Ultraviolet (EUV) and white-light coronagraph images. The main aim is to understand the evolution of plasmoids at different spatio-temporal scales using existing ground- and space-based instruments. We identified the plasmoids in current sheet observed in the successive images of {\it Atmospheric Imaging Assembly} (AIA) and white-light coronagraphs, K-Cor and LASCO/C2. We found that the current sheet is accompanied by several plasmoids moving upwards and downwards. Our analysis showed that the downward and upward moving plasmoids have average width of 5.92 Mm and 5.65 Mm, respectively in the AIA field of view (FOV). However, upward moving plasmoids have average width of 64 Mm in the K-Cor which evolves to a mean width of 510 Mm in the LASCO/C2 FOV. Upon tracking the plasmoids in successive images, we observe that downward and upward moving plasmoids have average speeds of $\sim$272 km s$^{-1}$ and $\sim$191 km s$^{-1}$ respectively in the EUV passbands. We note that the plasmoids become super-Alfvénic when they reach at LASCO FOV. Furthermore, we estimate that the null-point of the current sheet at $\approx$ 1.15 R$_\odot$ where bidirectional plasmoid motion is observed. We study the width distribution of plasmoids formed and notice that it is governed by a power law with a power index of -1.12. Unlike previous studies there is no difference in trend for small and large scale plasmoids. The presence of accelerating plasmoids near the neutral point indicates a longer diffusion region as predicted by MHD models.
