Abstract

This study is aimed at finding an answer to the following question: are there any fundamental differences in the generation of coronal mass ejections (CMEs) with different speeds, especially low and high speeds, detected in the field of view of LASCO coronagraphs? Fast CMEs are conventionally understood as mass ejections with a linear projection velocity in LASCO field of view \({{V}_{{LIN}}}\) > 1500 km/s; slow CMEs are those with \({{V}_{{LIN}}}\) ≤ 600 km/s. CMEs with \({{V}_{{LIN}}}\) between 600 and 1500 km/s are referred to as mass ejections with intermediate speed. The results of the analysis are presented by the example of three halo-type CME events (fast, slow, and intermediate) with sources in the sunspot groups removed from the center of the solar disk by no more than 45°. For analysis, we used data from SDO/AIA telescopes and the SDO/HMI instrument, as well as the LASCO C2 and C3 coronagraphs. The properties of active regions in which CMEs with different speeds have occurred are compared. The morphological features of the formation of the selected mass ejections based on the observations in the extreme ultraviolet lines are compared with features of their kinematics. Using the data of vector measurements of the photospheric magnetic field with the SDO/HMI instrument over the regions of CME formation, the altitude distributions of the magnetic field are calculated in the nonlinear force-free approximation. The analysis of these distributions showed that before the onset of a CME-related flare, the rate of altitude variation in the magnetic field above the CME generation site is noticeably different for all selected events.

中文翻译：

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在LASCO日冕仪的视野中比较以不同速度移动的CME的生成特征

摘要

这项研究旨在寻找以下问题的答案：在LASCO冠状动脉造影仪的视野中检测到的不同速度（尤其是低速和高速）的日冕物质抛射（CME）的产生中是否存在根本差异？传统上将快速CME理解为在LASCO视场\（{{V} _ {{LIN}}} \）中线性投影速度大于1500 km / s的质量喷射；慢速CME是\（{{V} _ {{LIN}}} \） ≤600 km / s的CME 。带有\（{{V} _ {{LIN}}} \）的CME介于600和1500 km / s之间的速度称为中等速度的质量喷射。分析结果以三个晕轮型CME事件（快速，缓慢和中间）为例，太阳黑子组中的源从太阳圆盘中心移开不超过45°。为了进行分析，我们使用了SDO / AIA望远镜和SDO / HMI仪器以及LASCO C2和C3的数据日冕仪。比较其中发生了不同速度的CME的有源区域的特性。将基于在极紫外线中观察到的选定质量喷射的形成的形态特征与它们的运动学特征进行了比较。使用SDO / HMI仪器在CME形成区域上的光球磁场矢量测量数据，以非线性无力逼近法计算磁场的高度分布。对这些分布的分析表明，在发生CME相关的耀斑之前，对于所有选定的事件，CME生成部位上方磁场的高度变化率明显不同。