Magnetohydrodynamics simulation of magnetic flux rope formation in a quadrupolar magnetic field configuration
Magnetohydrodynamics simulation of magnetic flux rope formation in a quadrupolar magnetic field configuration
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四极磁场结构中磁通绳形成的磁流体动力学模拟
DOI：
10.1088/1361-6587/acdd1d
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发表时间：
2023
影响因子：
2.2
通讯作者：
Bhattacharyya, R
中科院分区：
文献类型：
--
作者：
Kumar, Sanjay;Prasad, Avijeet;Nayak, Sushree S;Agarwal, Satyam;Bhattacharyya, R
磁通绳在太阳大气中的高能事件中扮演着重要的角色，如太阳耀斑和日冕物质抛射。重要的是，太阳观测表明，一些耀斑事件与四极磁结构有关。然而，在这种磁组态中MFR的形成和随后的演化仍然需要完全了解。本文用理想化的磁流体力学(MHD)方法模拟了四极磁组态MFR的形成过程。通过修改三维线性无力磁场来构造具有四极配置的合适的初始磁场。初始磁场包含由X型零点组成的中性线。模拟的动力学最初表明，位于极性反转线(PILs)上的相反方向的磁力线彼此朝向彼此移动，导致磁重联。由于这些重新连接，在PILS上方形成了四个高度扭曲的MFR。随着时间的推移，MFR的脚点向X型中性线移动并重新连接，在中性线周围产生复杂的磁结构，从而使四极配置中的MFR拓扑比在双极环系统中形成的拓扑更加复杂。进一步的演化揭示了MFR的非均匀上升。重要的是，模拟表明，磁组态中预先存在的X型零点可能对MFRS的演化至关重要，并可能导致在四极组态中的一些耀斑事件开始时观察到的亮化。
Magnetic flux ropes (MFRs) play an important role in high-energetic events like solar flares and coronal mass ejections in the solar atmosphere. Importantly, solar observations suggest an association of some flaring events with quadrupolar magnetic configurations. However, the formation and subsequent evolution of MFRs in such magnetic configurations still need to be fully understood. In this paper, we present idealized magnetohydrodynamics (MHD) simulations of MFR formation in a quadrupolar magnetic configuration. A suitable initial magnetic field having a quadrupolar configuration is constructed by modifying a three-dimensional linear force-free magnetic field. The initial magnetic field contains neutral lines, which consist of X-type null points. The simulated dynamics initially demonstrate the oppositely directed magnetic field lines located across the polarity inversion lines (PILs) moving towards each other, resulting in magnetic reconnections. Due to these reconnections, four highly twisted MFRs form over the PILs. With time, the foot points of the MFRs move towards the X-type neutral lines and reconnect, generating complex magnetic structures around the neutral lines, thus making the MFR topology more complex in the quadrupolar configuration than those formed in bipolar loop systems. Further evolution reveals the non-uniform rise of the MFRs. Importantly, the simulations indicate that the pre-existing X-type null points in magnetic configurations can be crucial to the evolution of the MFRs and may lead to the observed brightenings during the onset of some flaring events in the quadrupolar configurations.
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DOI：
10.1086/170799
发表时间：
1991
期刊：
The Astrophysical Journal
影响因子：
--
作者：
R. Dahlburg;S. Antiochos;T. Zang
通讯作者：
T. Zang
DOI：
10.3847/1538-4357/abb8d2
发表时间：
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期刊：
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影响因子：
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作者：
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影响因子：
2.2
作者：
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通讯作者：
P. Smolarkiewicz
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DOI：
--
发表时间：
2012
期刊：
影响因子：
--
作者：
B. V. Compernolle;W. Gekelman
通讯作者：
W. Gekelman
DOI：
--
发表时间：
2013
期刊：
Journal of Physical Science and Application
影响因子：
--
作者：
Tohru Tashiro;and Wakako Kakuta
通讯作者：
and Wakako Kakuta