Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 509, Issue 1, Pages 406-420Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stab2954
Keywords
Sun: Flares; MHD; Magnetic reconnection; Sun:coronal mass ejections (CMEs); Instabilities; Plasmas
Categories
Funding
- Strategic Priority Research Programme of Chinese Academy of Sciences [XDA17040507, QYZDJ-SSWSLH012]
- Natural Science Fundation of China [11933009, 11973083, 12073073, U2031141]
- Yunling Scholar Project of the Yunnan Province
- Yunnan Province Scientist Workshop of Solar Physics
- Applied Basic Research of Yunnan Province [2019FB005]
- China Scholarship Council [201904910573]
- NSF [AGS-AGS1723313, AST-1735525]
- Natural Science Foundation of Henan Province [212300410210]
- NASA [80NSSC18K0732]
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In this study, magnetohydrodynamics numerical experiments were conducted to investigate the dynamic behaviour of the current sheet between coronal mass ejection and solar flare. The research found that the CS exhibits oscillations and plasmoid motions, providing insights into the evolution of solar activities.
In this paper, we performed magnetohydrodynamics numerical experiments to look into the dynamic behaviour of the current sheet (CS) between the corona! mass ejection (CME) and the associated solar flare, especially the CS oscillation and plasmoid motions in corona! conditions. During the evolution, the disrupting magnetic configuration becomes asymmetric first in the buffer region at the bottom of the CME bubble. The Rayleigh-Taylor instability in the buffer region and the deflected motion of the plasma driven by the termination shock at the bottom of the CME bubble cause the buffer region to oscillate around the y-axis. The local oscillation propagates downwards through the CS, prompting an overall CS oscillation. As the buffer region grows, the oscillation period becomes longer, increasing from about 30 s to about 16 min. Meanwhile, there is another separated oscillation with a period between 0.25 and 1.5 min in the cusp region of the flare generated by velocity shearing. The tearing mode instability yields formations of plasmoids inside the CS. The motions of all the plasmoids observed in the experiment accelerate, which implies that the large-scale CME/flare CS itself in the true eruptive event is filled with the diffusion region according the the standard theory of magnetic reconnection.
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