Understanding the white-light flare on 2012 March 9: evidence of a two-step magnetic reconnection

doi:10.1051/0004-6361/201219941

YNAO OpenIR > 抚仙湖太阳观测和研究基地

	Understanding the white-light flare on 2012 March 9: evidence of a two-step magnetic reconnection
	Hao, Q 1; Guo, Y 1,2; Dai, Y 1,2; Ding, MD 1,2; Li, Z1,2 ; Zhang XY(张霄宇)3 ; Fang, C 1,2; Hao, Q (reprint author), Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China.
发表期刊	ASTRONOMY & ASTROPHYSICS
	2012-08
卷号	544
DOI	10.1051/0004-6361/201219941
产权排序	第3完成单位
收录类别	SCI ; EI
关键词	Magnetic Reconnection Sun: Flares Sun: Magnetic Topology Sun: Radio Radiation
摘要	Aims. We attempt to understand the white-light flare (WLF) that was observed on 2012 March 9 with a newly constructed multi-wavelength solar telescope called the Optical and Near-infrared Solar Eruption Tracer (ONSET). Methods. We analyzed WLF observations in radio, Ha, white-light, ultraviolet, and X-ray bands. We also studied the magnetic configuration of the flare via the nonlinear force-free field (NLFFF) extrapolation and the vector magnetic field observed by the Helioseismic and Magnetic Imager (HMI) on board the Solar Dynamics Observatory (SDO). Results. Continuum emission enhancement clearly appeared at the 3600 angstrom and 4250 angstrom bands, with peak contrasts of 25% and 12%, respectively. The continuum emission enhancement closely coincided with the impulsive increase in the hard X-ray emission and a microwave type III burst at 03:40 UT. We find that the WLF appeared at one end of either the sheared or twisted field lines or both. There was also a long-lasting phase in the Ha and soft X-ray bands after the white-light emission peak. In particular, a second, yet stronger, peak appeared at 03:56 UT in the microwave band. Conclusions. This event shows clear evidence that the white-light emission was caused by energetic particles bombarding the lower solar atmosphere. A two-step magnetic reconnection scenario is proposed to explain the entire process of flare evolution, i.e., the first-step magnetic reconnection between the field lines that are highly sheared or twisted or both, and the second-step one in the current sheet, which is stretched by the erupting flux rope. The WLF is supposed to be triggered in the first-step magnetic reconnection at a relatively low altitude.
项目资助者	National Natural Science Foundation of China (NSFC) [10878002, 10610099, 10933003, 10673004, 11103009] ; 973 project [2011CB811402]
语种	英语
学科领域	Astronomy & Astrophysics
文章类型	Article
ISSN	0004-6361
URL	查看原文
WOS记录号	WOS:000308290100177
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	HARD X-RAY ; CONTINUUM EMISSION ; INFRARED CONTINUUM ; LOWER ATMOSPHERE ; SOLAR-FLARES ; RECONSTRUCTION ; HINODE ; FIELDS ; YOHKOH
引用统计	被引频次：23[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ynao.ac.cn/handle/114a53/4684
专题	抚仙湖太阳观测和研究基地
通讯作者	Hao, Q (reprint author), Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China.
作者单位	1.School of Astronomy and Space Science, Nanjing University, 210093 Nanjing, PR China 2.Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, 210093 Nanjing, PR China 3.Yunnan Astronomical Observatory, Chinese Academy of Sciences, 620011 Kunming, PR China
推荐引用方式 GB/T 7714	Hao, Q,Guo, Y,Dai, Y,et al. Understanding the white-light flare on 2012 March 9: evidence of a two-step magnetic reconnection[J]. ASTRONOMY & ASTROPHYSICS,2012,544.
APA	Hao, Q.,Guo, Y.,Dai, Y.,Ding, MD.,Li, Z.,...&Hao, Q .(2012).Understanding the white-light flare on 2012 March 9: evidence of a two-step magnetic reconnection.ASTRONOMY & ASTROPHYSICS,544.
MLA	Hao, Q,et al."Understanding the white-light flare on 2012 March 9: evidence of a two-step magnetic reconnection".ASTRONOMY & ASTROPHYSICS 544(2012).

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