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Changes of Magnetic Energy and Helicity in Solar Active Regions from Major Flares
Yang Liu, Brian T. Welsch, Gherardo Valori +5
Magnetic free energy powers solar flares and coronal mass ejections (CMEs), and the buildup of magnetic helicity might play a role in the development of unstable structures that su…
Data-constrained MHD simulation for the eruption of a filament-sigmoid system in solar active region 11520
Tie Liu, Yuhong Fan, Yingna Su +3
The separation of a filament and sigmoid is observed during an X1.4 flare on July 12, 2012 in solar active region 11520, but the corresponding magnetic field change is not clear. W…
Modelling the magnetic structure of a large-scale horse-shoe-like filament in a decaying and diffuse active region
Kaifeng Kang, Yang Guo, Ilia I. Roussev +2
A large-scale, horse-shoe-like filament was investigated and the magnetic field around it was reconstructed. This is an intermediate filament (IF) that appeared on the solar disk f…
Magnetic field extrapolation in active region well comparable with observations in multiple layers
Fu Yu, Jie Zhao, Yang Su +4
Magnetic field extrapolation is a fundamental tool to reconstruct the three-dimensional magnetic field above the solar photosphere. However, the prevalently used force-free field m…
Relationship between Successive Flares in the Same Active Region and Space-Weather HMI Active Region Patch (SHARP) Parameters
Hao Ran, Ying D. Liu, Yang Guo +1
A solar active region (AR) may produce multiple notable flares during its passage across the solar disk. We investigate successive flares from flare-eruptive active regions, and ex…