Self-constrained Magnetic Reconnection of a Solar Flare Co-spatial with a Non-ejected Filament
Abstract
For flares associated with eruptive filaments, the filament normally rises above the post-flare loops. Here, we report an unusual event in which the post-flare loops instead overlie a filament that remains non-ejected throughout the flare. This event was simultaneously captured by the Chinese Hα Solar Explorer (CHASE), the Solar Extreme-UltraViolet Imager (SUVI) onboard Fengyun-4C, the Hard X-ray Imager (HXI) onboard the Advanced Space-based Solar Observatory (ASO-S) and the Solar Dynamics Observatory (SDO). Extreme Ultraviolet (EUV) observations provided by FY4C/SUVI and SDO show that two hot loop systems form at the flare onset. The western end of the northern loop system undergoes a southwestward drifting motion with gradually increasing shear, whereas the southern loop system progressively converges toward and eventually overlies the northern one. Meanwhile, three-dimensional magnetic field extrapolations reveal an increase in both the twist of the filament-supporting magnetic structure and its poloidal magnetic field after the flare. Taken together, these observations suggest that the flare is driven by a self-constraining zipper-type magnetic reconnection, in which highly sheared arcades reconnect to form a series of overlying flare arcades and an underlying flux rope. This reconnection continuously strengthens the magnetic confinement of the filament, preventing its outward eruption, while facilitating substantial plasma drainage along the reconnected magnetic field revealed by the CHASE Hα spectroscopic observations.
Related
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BibTeX
@misc{qiu2026selfconstrained,
title = {{Self-constrained Magnetic Reconnection of a Solar Flare Co-spatial with a Non-ejected Filament}},
author = {Ye Qiu and Changxue Chen and Anqin Chen and Chuan Li and Yang Guo and Linggao Kong and Feng Lu and Xiaohu Zhang and Weiguo Zong and Jinsong Wang and Xinkai Li and Peng Wang and Kefei Song and Bo Chen},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.32144},
eprint = {2609.32144},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.32144},
}
RIS
TY - UNPB
TI - Self-constrained Magnetic Reconnection of a Solar Flare Co-spatial with a Non-ejected Filament
AU - Ye Qiu
AU - Changxue Chen
AU - Anqin Chen
AU - Chuan Li
AU - Yang Guo
AU - Linggao Kong
AU - Feng Lu
AU - Xiaohu Zhang
AU - Weiguo Zong
AU - Jinsong Wang
AU - Xinkai Li
AU - Peng Wang
AU - Kefei Song
AU - Bo Chen
PY - 2026
DA - 2026/09/26
PB - arXiv
DO - 10.48550/arxiv.2609.32144
UR - https://arxiv.org/abs/2609.32144
AB - For flares associated with eruptive filaments, the filament normally rises above the post-flare loops. Here, we report an unusual event in which the post-flare loops instead overlie a filament that remains non-ejected throughout the flare. This event was simultaneously captured by the Chinese Hα Solar Explorer (CHASE), the Solar Extreme-UltraViolet Imager (SUVI) onboard Fengyun-4C, the Hard X-ray Imager (HXI) onboard the Advanced Space-based Solar Observatory (ASO-S) and the Solar Dynamics Observatory (SDO). Extreme Ultraviolet (EUV) observations provided by FY4C/SUVI and SDO show that two hot loop systems form at the flare onset. The western end of the northern loop system undergoes a southwestward drifting motion with gradually increasing shear, whereas the southern loop system progressively converges toward and eventually overlies the northern one. Meanwhile, three-dimensional magnetic field extrapolations reveal an increase in both the twist of the filament-supporting magnetic structure and its poloidal magnetic field after the flare. Taken together, these observations suggest that the flare is driven by a self-constraining zipper-type magnetic reconnection, in which highly sheared arcades reconnect to form a series of overlying flare arcades and an underlying flux rope. This reconnection continuously strengthens the magnetic confinement of the filament, preventing its outward eruption, while facilitating substantial plasma drainage along the reconnected magnetic field revealed by the CHASE Hα spectroscopic observations.
ER -