伪流光结构内奇特日冕波的观测

IF 6.4 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Jun Li, Ruisheng Zheng, Xiaoqian Wang, Yao Chen
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引用次数: 0

摘要

日冕极紫外线(EUV)波是在日冕中传播的大规模扰动,与太阳爆发密切相关。它们可以在很宽的温度范围内干扰周围的等离子体,导致在多个EUV通带同时观测,波前通常在AIA 193和211 Å通道中观测得最好,温度范围为1.6至2 MK。在这里,我们报告了一个特殊的EUV波,在193和211 Å中不可见,但在AIA 171 Å中出现,对应于较低的温度。在日冕射流的驱动下,波以约560 km s−1的速度传播。差分发射测量(DEM)分析表明,波前的发射集中在~ 1.25 MK,低于典型的主导温度。此外,利用位场源面(PFSS)法外推的场表明存在典型的伪拖缆结构。因此,我们提出,这可能是极紫外光波在伪流内发生和传播的第一个案例,其可见性可能是由伪流内相对较冷的等离子体决定的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Observations of a peculiar coronal wave inside a pseudo-streamer structure

Coronal extreme ultraviolet (EUV) waves are large-scale disturbances propagating in the corona and are closely associated with solar eruptions. They can disturb the ambient plasma over a wide temperature range, resulting in simultaneous observations in multiple EUV passbands, and the wavefronts are typically best observed in AIA 193 and 211 Å channels with temperatures ranging from 1.6 to 2 MK. Here, we report a peculiar EUV wave that was invisible in the 193 and 211 Å but appeared instead in AIA 171 Å, corresponding to a lower temperature. Driven by a coronal jet, the wave propagated at a speed of ∼560 km s−1. The differential emission measure (DEM) analysis shows that the emission of the wavefront concentrated at ∼1.25 MK, lower than the typical predominant temperatures. In addition, the fields extrapolated using the potential field source surface (PFSS) method indicate the existence of a typical pseudo-streamer structure. Hence, we propose that it is possibly the first case of an EUV wave occurring and propagating inside a pseudo-streamer, and its visibility is likely determined by the relatively cooler plasma within the pseudo-streamer.

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来源期刊
Science China Physics, Mechanics & Astronomy
Science China Physics, Mechanics & Astronomy PHYSICS, MULTIDISCIPLINARY-
CiteScore
10.30
自引率
6.20%
发文量
4047
审稿时长
3 months
期刊介绍: Science China Physics, Mechanics & Astronomy, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research. Science China Physics, Mechanics & Astronomy, is published in both print and electronic forms. It is indexed by Science Citation Index. Categories of articles: Reviews summarize representative results and achievements in a particular topic or an area, comment on the current state of research, and advise on the research directions. The author’s own opinion and related discussion is requested. Research papers report on important original results in all areas of physics, mechanics and astronomy. Brief reports present short reports in a timely manner of the latest important results.
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