Magnetohydrodynamics evolution of three-dimensional magnetic null in NOAA active region 11515 initiated using non-force-free field extrapolation

被引:4
作者
Kumar, Sanjay [1 ]
Prasad, Avijeet [2 ,3 ]
Sarkar, Ranadeep [4 ]
Bhattacharyya, Ramit [5 ]
机构
[1] Patna Univ, Dept Phys, Patna, India
[2] Univ Oslo, Rosseland Ctr Solar Phys, Oslo, Norway
[3] Univ Oslo, Inst Theoret Astrophys, Oslo, Norway
[4] Univ Helsinki, Dept Phys, Helsinki, Finland
[5] Phys Res Lab, Ahmadabad, India
来源
FRONTIERS IN ASTRONOMY AND SPACE SCIENCES | 2022年 / 9卷
基金
芬兰科学院; 欧洲研究理事会;
关键词
magnetohydrodynamics (MHD); magnetic reconnection; magnetic fields; solar flares; extrapolation; FLARE RIBBONS; ENVIRONMENT;
D O I
10.3389/fspas.2022.1039061
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Magnetohydrodynamics simulation of active region NOAA 11515 is performed to examine the initiation of the M5.6 flaring event that starts around 10:43 UT on 2 July 2012. The simulation is conducted using an extrapolated non-force-free magnetic field generated from the photospheric vector magnetogram of the active region as the initial magnetic field. The magnetic field shows the presence of a three-dimensional (3D) magnetic null with the corresponding dome overlying a filament and a low-lying magnetic flux rope, observed in 304 & ANGS; and 131 & ANGS; respectively. The simulated dynamics, triggered by the initial Lorentz force, lead to the bifurcations of the flux rope, which is similar to the observed bifurcation in the 131 & ANGS; brightenings. Additionally, the rope exhibits a rise and reconnects at the 3D null. These reconnections convert field lines of the rope into the anchored outer spine of the 3D null-explaining the occurrence of a nearby confined C-class flare. Further, the results show that the field lines of the flux rope reach the vicinity of the filament and become non-parallel to the field lines of the filament. This initiates the reconnections between the rope and the field lines of the filament-activating the filament for the eruption. This interesting interaction of the flux rope and filament seems to contribute to the onset of the M-class flare.
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页数:13
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