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学科：天体物理. 空间物理学. 等离子体物理
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[Title] Two-stage primary acceleration in filament initial eruption under a fan-spine magnetic configuration
影响因子：5.4
DOI码：10.48550/arXiv.2512.07566
教研室：天体物理
发表刊物：The Astrophysical Journal
关键字：Solar filaments (1495);Solar flares (1496);Solar magnetic fields (1503)
摘要：Understaning the filament rising process is crucial for unveiling the triggering mechanisms of the coronal mass ejections and forecasting the space weather. In this paper,we present a detailed study on the filament initial eruption under a fan-spine structure. It was found that the filament underwent two distinct acceleration stages corresponding to a calss M1.0 and M4.6 flare event,respectively. The first acceleration stage commenced with the filament splitting,after which the upper portion was subsequently heated being a hot channel and slow rose at an average speed of 22 km/s. A set of hot reverse C-shaped loops appeared repeatedly during the filament splitting and a hook structure was recognized at this phase,suggesting ongoing growth of the magnetic flux rope (MFR). When it reached a certain altitude,the hot channel appeared to get into a quasi-static phase with its upper edge seriously decelerated and lower edge expanding downward. Approximately 30 minutes later,as a distinct annular ribbon appeared outside the hook structure,the hot channel rose again at a velocity over 50 km/s accompanied with rapid footpoints drifting,and experienced the second acceleration stage with its axial flux increased to 1.1 X 10^{21} Mx. It is deduced that the filament initial eruption under a magnetic dome possess multi kinetic process. We suggest that the magnetic reconnection taken place within and beneath the filament continues to trigger the growth of pre-eruptive MFR and the first acceleration,when the magnetic reconnection above the filament plays a key role in the second acceleration.
备注：accepted
合写作者：Yu K,Zhou C,Liu Q,Cheng X,Guo JH,Sha FY,Qiu Y,Liu Y
第一作者：Li HT
论文类型：期刊论文
论文编号：008
学科门类：理学
一级学科：天文学
ISSN号：0004-637X
是否译文：否
发表时间：2026-01-05
收录刊物：SCI