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题名:
EXPLOSIVE CHROMOSPHERIC EVAPORATION IN A CIRCULAR-RIBBON FLARE
作者: Zhang, Q. M.1,2; Li Di(李菂)1; Ning, Z. J.1; Su, Y. N.1; Ji, H. S.1; Guo, Y.3,4
关键词: Sun: chromosphere ; Sun: corona ; Sun: flares ; Sun: X-rays, gamma-rays ; techniques: spectroscopic
刊名: ASTROPHYSICAL JOURNAL
发表日期: 2016-08-10
DOI: 10.3847/0004-637X/827/1/27
卷: 827, 期:1
文章类型: Article
收录类别: SCI
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: LOOP RADIATIVE HYDRODYNAMICS ; X-RAY JETS ; SOLAR-FLARE ; MAGNETIC RECONNECTION ; MAGNETOHYDRODYNAMIC SIMULATION ; MULTIWAVELENGTH OBSERVATIONS ; OBSERVATIONAL EVIDENCE ; PARTICLE-ACCELERATION ; NONTHERMAL ELECTRONS ; EXTREME-ULTRAVIOLET
英文摘要:

In this paper, we report our multiwavelength observations of the C4.2 circular-ribbon flare in active region (AR) 12434 on 2015 October 16. The short-lived flare was associated with positive magnetic polarities and a negative polarity inside, as revealed by the photospheric line-of-sight magnetograms. Such a magnetic pattern is strongly indicative of a magnetic null point and spine-fan configuration in the corona. The flare was triggered by the eruption of a mini-filament residing in the AR, which produced the inner flare ribbon (IFR) and the southern part of a closed circular flare ribbon (CFR). When the eruptive filament reached the null point, it triggered null point magnetic reconnection with the ambient open field and generated the bright CFR and a blowout jet. Raster observations of the Interface Region Imaging Spectrograph show plasma upflow at speeds of 35-120 km s(-1) in the Fe XXI lambda 1354.09 line (log T approximate to 7.05) and downflow at speeds of 10-60 km s(-1) in the Si IV lambda 1393.77 line (log T approximate to 4.8) at certain locations of the CFR and IFR during the impulsive phase of the flare, indicating explosive chromospheric evaporation. Coincidence of the single hard X-ray source at 12-25 keV with the IFR and calculation based on the thick-target model suggest that the explosive evaporation was most probably driven by nonthermal electrons.

语种: 英语
项目资助者: Norwegian Space Center (NSC, Norway) ; NSFC(11303101 ; open research program of Key Laboratory of Solar Activity, National Astronomical Observatories, CAS(KLSA201510) ; Strategic Priority Research Program-The Emergence of Cosmological Structures of the CAS(XDB09000000) ; Youth Fund of Jiangsu(BK20141043) ; One Hundred Talent Program of Chinese Academy of Sciences ; 11333009 ; 11573072 ; 11473071)
WOS记录号: WOS:000382009500027
Citation statistics:
内容类型: 期刊论文
版本: 出版稿
URI标识: http://ir.bao.ac.cn/handle/114a11/5275
Appears in Collections:射电天文研究部_期刊论文

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作者单位: 1.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Sci, Nanjing 210008, Jiangsu, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China
3.Katholieke Univ Leuven, Dept Math, Ctr Math Plasma Astrophys, B-3001 Leuven, Belgium
4.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210023, Jiangsu, Peoples R China

Recommended Citation:
Zhang, Q. M.,Li, D.,Ning, Z. J.,et al. EXPLOSIVE CHROMOSPHERIC EVAPORATION IN A CIRCULAR-RIBBON FLARE[J]. ASTROPHYSICAL JOURNAL,2016,827(1).
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