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Explosive Chromospheric Evaporation Driven by Nonthermal Electrons around One Footpoint of a Solar Flare Loop
Li, D.1,2,3; Ning, Z. J.1; Huang, Y.1; Zhang, Q. M.1,2
2017-05-20
Source PublicationASTROPHYSICAL JOURNAL LETTERS
ISSN2041-8205
Volume841Issue:1Pages:6
Abstract

We explore the temporal relationship between microwave/hard X-ray (HXR) emission and Doppler velocity during the impulsive phase of a solar flare on 2014 October 27 (SOL2014-10-27) that displays a pulse on the light curves in the microwave (34 GHz) and HXR (25-50 keV) bands before the flare maximum. Imaging observation shows that this pulse mainly comes from one footpoint of a solar flare loop. The slit of the Interface Region Imaging Spectrograph (IRIS) stays at this footpoint during this solar flare. The Doppler velocities of Fe XXI. 1354.09 angstrom and Si IV. 1402.77. angstrom are extracted from the Gaussian fitting method. We find that the hot line of Fe XXI. 1354.09 angstrom (log T similar to 7.05) in the corona exhibits blueshift, while the cool line of Si IV. 1402.77 angstrom (log T similar to 4.8) in the transition region exhibits redshift, indicating explosive chromospheric evaporation. Evaporative upflows along the flare loop are also observed in the AIA 131 angstrom image. To our knowledge, this is the first report of chromospheric evaporation evidence from both spectral and imaging observations in the same flare. Both microwave and HXR pulses are well correlated with the Doppler velocities, suggesting that the chromospheric evaporation is driven by nonthermal electrons around this footpoint of a solar flare loop.

Keywordline: profiles Sun: flares Sun: radio radiation Sun: UV radiation Sun: X-rays, gamma rays
DOI10.3847/2041-8213/aa71b0
WOS KeywordULTRAVIOLET IMAGING SPECTROMETER ; OBSERVATIONAL EVIDENCE ; IMPULSIVE PHASE ; IRIS ; RESOLUTION ; HINODE ; SPECTROSCOPY ; MICROFLARE ; CONVERSION ; EVOLUTION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000402563400007
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:13[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23055
Collection中国科学院紫金山天文台
Corresponding AuthorLi, D.
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.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210023, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Li, D.,Ning, Z. J.,Huang, Y.,et al. Explosive Chromospheric Evaporation Driven by Nonthermal Electrons around One Footpoint of a Solar Flare Loop[J]. ASTROPHYSICAL JOURNAL LETTERS,2017,841(1):6.
APA Li, D.,Ning, Z. J.,Huang, Y.,&Zhang, Q. M..(2017).Explosive Chromospheric Evaporation Driven by Nonthermal Electrons around One Footpoint of a Solar Flare Loop.ASTROPHYSICAL JOURNAL LETTERS,841(1),6.
MLA Li, D.,et al."Explosive Chromospheric Evaporation Driven by Nonthermal Electrons around One Footpoint of a Solar Flare Loop".ASTROPHYSICAL JOURNAL LETTERS 841.1(2017):6.
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