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Imaging Observations of Chromospheric Evaporation in a Circular-ribbon Flare
Zhang, Q. M.1; Li, D.1,2,3; Huang, Y.1
2019-01-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume870Issue:2Pages:10
Corresponding AuthorZhang, Q. M.(zhangqm@pmo.ac.cn)
AbstractIn this paper, we report our multiwavelength imaging observations of chromospheric evaporation in a C5.5 circular-ribbon flare (CRF) on 2014 August 24. The flare was observed by the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory, the X-ray Telescope (XRT) on board the Hinode spacecraft, and the ground-based Nobeyama Radioheliograph. The CRF consisted of a discrete circular ribbon with a diameter of similar to 1' and a short inner ribbon observed in ultraviolet (UV), extreme-ultraviolet, soft X-ray (SXR), and especially in 17 GHz. The peak time (similar to 04:58 UT) of the flare in 17 GHz coincided with that in UV 1600 angstrom and SXR derivative as a hard X-ray proxy, implying the peak time of impulsive energy deposition in the lower atmosphere. Shortly after the peak time, converging motion and filling processes in the flare loop were revealed in AIA 131 A and two XRT filters (Be_thin and Be_med), which are clear evidence for chromospheric evaporation upflows. The chromospheric evaporation lasted for similar to 6 minutes until similar to 05:04 UT. The temperature, density, and apparent velocities of the upflows are similar to 10(7) K, similar to 1.8 x 10(10) cm(-3), and 50-630 km s(-1) with a mean value of similar to 170 km s(-1). By comparison with previous models, we are able to estimate that energies above 5 x 10(10) erg cm(-2) s(-1) are likely needed to explain the observational results. Since heating by thermal conduction does not seem to provide enough energy, alternative mechanisms such as nonthermal electrons or Alfvenic waves might need to be invoked.
KeywordSun: chromosphere Sun: flares Sun: UV radiation Sun: X-rays, gamma rays
DOI10.3847/1538-4357/aaf4b7
WOS KeywordLOOP RADIATIVE HYDRODYNAMICS ; DRIVEN EVAPORATION ; IMPULSIVE PHASE ; SOLAR ; EMISSION ; DYNAMICS ; SPECTROSCOPY ; ULTRAVIOLET ; RESOLUTION ; MODELS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000455991600003
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/20002
Collection中国科学院紫金山天文台
Corresponding AuthorZhang, Q. M.
Affiliation1.Chinese Acad Sci, Key Lab Dark Matter & Space Sci, Purple Mt Observ, Nanjing 210034, Jiangsu, Peoples R China
2.Chinese Acad Sci, State Key Lab Space Weather, Beijing 100190, Peoples R China
3.Natl Astron Observ, CAS Key Lab Solar Act, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Q. M.,Li, D.,Huang, Y.. Imaging Observations of Chromospheric Evaporation in a Circular-ribbon Flare[J]. ASTROPHYSICAL JOURNAL,2019,870(2):10.
APA Zhang, Q. M.,Li, D.,&Huang, Y..(2019).Imaging Observations of Chromospheric Evaporation in a Circular-ribbon Flare.ASTROPHYSICAL JOURNAL,870(2),10.
MLA Zhang, Q. M.,et al."Imaging Observations of Chromospheric Evaporation in a Circular-ribbon Flare".ASTROPHYSICAL JOURNAL 870.2(2019):10.
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