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The Precursor Phase of an X-class Flare: Magnetic Reconnection, Powering and Non-thermal Electrons

文献类型：期刊论文

作者Shen, Jinhua3; Ji, Haisheng1,2; Su, Yingna1,2
刊名RESEARCH IN ASTRONOMY AND ASTROPHYSICS
出版日期2022
卷号22期号:1页码:10
ISSN号1674-4527
关键词magnetic reconnection Sun: flares Sun: magnetic fields
DOI10.1088/1674-4527/ac389b
通讯作者Shen, Jinhua(shenjh@xao.ac.cn)
英文摘要In this paper, we report three interesting phenomena that occurred during the precursor phase of the X1.6 class flare on 2014 September 10. (1) The magnetic reconnection initiating the flare occurs between one of the two J-shaped magnetic flux ropes that constitute a sigmoidal structure and the overlying sheared magnetic arcade that runs across the sigmoid over its middle part. The reconnection formed an erupting structure that ultimately leads to flare onset. Another J-shaped magnetic flux rope remains unaffected during the whole eruption. The phenomenon is revealed by the observation made by the Atmospheric Imaging Assembly on board the Solar Dynamic Observatory (SDO) at 94 and 131 angstrom. (2) Being simultaneously with starting time of the precursor, photospheric vertical electric current (VEC) around the footpoint region of the overlying magnetic arcade underwent an obvious increase, as observed by the Helioseismic and Magnetic Imager (HMI) on board SDO. By only taking into account the VEC with current density over 3 sigma value (1 sigma: 10 mA m(-2)), we are able to pick out precursor-associated VEC increase starting from nearly the level of zero. We regard it as a kind of powering process for the magnetic reconnection between the two magnetic loops. (3) With high-resolution narrow-band Helium 10830 angstrom images taken by Goode Solar Telescope at Big Bear Solar Observatory (BBSO), we observe a narrow absorption (dark) front that runs along the erupting magnetic structure (or the erupting hot channel) and moves in the direction of the eruption during the precursor phase. Assuming the excitation mechanism of Helium atoms along the absorption front by non-thermal electrons, the phenomenon shows that the interaction between the erupted hot channel and the overlying (or surrounding) magnetic field has yielded electron acceleration.
WOS关键词SOLAR-FLARES ; RAY ; FILAMENT ; FIELDS ; ONSET
资助项目National Natural Science Foundation of China[11773061] ; National Natural Science Foundation of China[11790302] ; West Young Scholars Programs CAS[2017XBQNXZ-A-007] ; CAS Key Lab of Solar Activity, NAOC, Key Lab for DMSA, CAS[KLSA 202106] ; NJIT ; US NSF[AGS-1821294] ; Korea Astronomy and Space Science Institute ; Seoul National University ; Key Laboratory of Solar Activities of Chinese Academy of Sciences (CAS) ; Operation, Maintenance and Upgrading Fund of CAS for Astronomical Telescopes and Facility Instruments
WOS研究方向Astronomy & Astrophysics
语种英语
出版者NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
WOS记录号WOS:000746161200001
资助机构National Natural Science Foundation of China ; West Young Scholars Programs CAS ; CAS Key Lab of Solar Activity, NAOC, Key Lab for DMSA, CAS ; NJIT ; US NSF ; Korea Astronomy and Space Science Institute ; Seoul National University ; Key Laboratory of Solar Activities of Chinese Academy of Sciences (CAS) ; Operation, Maintenance and Upgrading Fund of CAS for Astronomical Telescopes and Facility Instruments
源URL[http://ir.xao.ac.cn/handle/45760611-7/4464]  
专题太阳物理研究室_太阳物理研究团组
通讯作者Shen, Jinhua
作者单位1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210023, Peoples R China
2.Chinese Acad Sci, Key Lab Dark Matter & Space Sci, Purple Mt Observ, Nanjing 210023, Peoples R China
3.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci 1 St, Urumqi 830011, Xinjiang, Peoples R China
推荐引用方式
GB/T 7714		 Shen, Jinhua,Ji, Haisheng,Su, Yingna. The Precursor Phase of an X-class Flare: Magnetic Reconnection, Powering and Non-thermal Electrons[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2022,22(1):10.
APA Shen, Jinhua,Ji, Haisheng,&Su, Yingna.(2022).The Precursor Phase of an X-class Flare: Magnetic Reconnection, Powering and Non-thermal Electrons.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,22(1),10.
MLA Shen, Jinhua,et al."The Precursor Phase of an X-class Flare: Magnetic Reconnection, Powering and Non-thermal Electrons".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 22.1(2022):10.

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来源：新疆天文台

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