Numerical Simulation on the Leading Edge of Coronal Mass Ejection in the Near-Sun Region

IF 4.8 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Zhixing Mei, Jing Ye, Yan Li, Shanshan Xu, Yuhao Chen, Jialiang Hu
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Abstract

Abstract The coronal mass ejections (CMEs) observed by white-light coronagraphs, such as the Large Angle and Spectrometric Coronagraph (LASCO) C2/C3, commonly exhibit the three-part structure, with the bright leading edge as the outermost part. In this work, we extend previous work on the leading edge by performing a large-scale 3D magnetohydrodynamic numerical simulation on the evolution of an eruptive magnetic flux rope (MFR) in a near-Sun region based on a radially stretched calculation grid in spherical coordination and the incorporation of solar wind. In the early stage, the new simulation almost repeats the previous results, i.e., the expanding eruptive MFR and associated CME bubble interact with the ambient magnetic field, which leads to the appearance of the helical current ribbon/boundary (HCB) wrapping around the MFR. The HCB can be interpreted as a possible mechanism of the CME leading edge. Later, the CME bubble propagates self-consistently to a larger region beyond a few solar radii from the solar center, similar to the early stage of evolution. The continuous growth and propagation of the CME bubbles leading to the HCB can be traced across the entire near-Sun region. Furthermore, we can observe the HCB in the white-light synthetic images as a bright front feature in the large field of view of LASCO C2 and C3.
近日区日冕物质抛射前缘的数值模拟
大角光谱日冕仪(LASCO) C2/C3等白光日冕仪观测到的日冕物质抛射(cme)通常呈现三部分结构,明亮的边缘为最外层。在这项工作中,我们扩展了先前的前沿工作,基于球面协调和太阳风的径向拉伸计算网格,对近太阳区域爆发磁通量绳(MFR)的演化进行了大规模三维磁流体动力学数值模拟。在早期阶段,新的模拟几乎重复了先前的结果,即膨胀的爆发MFR和相关的CME气泡与周围磁场相互作用,导致螺旋电流带/边界(HCB)环绕MFR的出现。HCB可以解释为CME前缘的一种可能机制。之后,日冕物质抛射气泡自我一致地传播到距离太阳中心几个太阳半径以外的更大区域,类似于演化的早期阶段。CME气泡导致HCB的持续增长和传播可以在整个近太阳区域被追踪到。此外,我们还可以在LASCO C2和C3的大视场中观察到白光合成图像中的HCB作为明亮的前沿特征。
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来源期刊
Astrophysical Journal
Astrophysical Journal 地学天文-天文与天体物理
CiteScore
8.40
自引率
30.60%
发文量
2854
审稿时长
1 months
期刊介绍: The Astrophysical Journal is the foremost research journal in the world devoted to recent developments, discoveries, and theories in astronomy and astrophysics.
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