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Observations of Electron-driven Evaporation in a Flare Precursor
Li, Dong1,2,3; Li, Ying1; Su, Wei4; Huang, Yu1; Ning, Zongjun1
2018-02-08
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume854Issue:1Pages:10
Abstract

We investigate the relationship between the blueshifts of a hot emission line and the nonthermal emissions in microwave and hard X-ray (HXR) wavelengths in the precursor of a solar flare on 2014 October 27. The flare precursor is identified as a small but well-developed peak in the soft X-ray and extreme-ultraviolet passbands before the GOES flare onset, which is accompanied by a pronounced burst in microwave 17 and. 34 GHz and in HXR 25-50 keV. The slit of the Interface Region Imaging Spectrograph (IRIS) stays on one ribbon-like transient during the flare precursor phase, which shows visible nonthermal emissions in Nobeyama Radioheliograph and RHESSI images. The IRIS spectroscopic observations show that the hot line of Fe XXI 1354.09. angstrom (log T similar to 7.05) displays blueshifts, while the cool line of Si IV 1402.77 angstrom (log T similar to 4.8) exhibits redshifts. The blueshifts and redshifts are well correlated with each other, indicative of an explosive chromospheric evaporation during the flare precursor phase combining a high nonthermal energy flux with a short characteristic timescale. In addition, the blueshifts of Fe XXI 1354.09 angstrom are well correlated with the microwave and HXR emissions, implying that the explosive chromospheric evaporation during the flare precursor phase is driven by nonthermal electrons.

Keywordline: profiles Sun: flares Sun: radio radiation Sun: UV radiation Sun: X-rays gamma rays techniques: spectroscopic
DOI10.3847/1538-4357/aaa9c0
WOS KeywordHIGH TIME RESOLUTION ; HARD X-RAY ; GENTLE CHROMOSPHERIC EVAPORATION ; LOOP RADIATIVE HYDRODYNAMICS ; REGION-IMAGING-SPECTROGRAPH ; CLASS SOLAR-FLARE ; NONTHERMAL ELECTRONS ; SUPRA-ARCADE ; SOHOS CDS ; MULTIWAVELENGTH
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000424758700001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22335
Collection中国科学院紫金山天文台
Corresponding AuthorLi, Dong
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China
2.Natl Astron Observ, CAS Key Lab Solar Act, Beijing 100012, Peoples R China
3.Chinese Acad Sci, Sate Key Lab Space Weather, Beijing 100190, Peoples R China
4.Huazhong Univ Sci & Technol, Sch Phys, MOE Key Lab Fundamental Phys Quant Measurements, Wuhan 430074, Hubei, Peoples R China
Recommended Citation
GB/T 7714
Li, Dong,Li, Ying,Su, Wei,et al. Observations of Electron-driven Evaporation in a Flare Precursor[J]. ASTROPHYSICAL JOURNAL,2018,854(1):10.
APA Li, Dong,Li, Ying,Su, Wei,Huang, Yu,&Ning, Zongjun.(2018).Observations of Electron-driven Evaporation in a Flare Precursor.ASTROPHYSICAL JOURNAL,854(1),10.
MLA Li, Dong,et al."Observations of Electron-driven Evaporation in a Flare Precursor".ASTROPHYSICAL JOURNAL 854.1(2018):10.
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