Spectroscopic Observations of a Current Sheet in a Solar Flare
Li, Y.1,2,3; Xue, J. C.1; Ding, M. D.2; Cheng, X.2; Su, Y.1; Feng, L.1; Hong, J.2; Li, H.1; Gan, W. Q.1

The current sheet is believed to be the region of energy dissipation via magnetic reconnection in solar flares. However, its properties, for example, the dynamic process, are not fully understood. Here, we report a current sheet in a solar flare (SOL2017-09-10T16:06) that was clearly observed by the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory as well as the EUV Imaging Spectrometer on Hinode. The high-resolution imaging and spectroscopic observations show that the current sheet is mainly visible in high-temperature (> 10 MK) passbands, particularly in the Fe XXIV. 192.03 A. line with a formation temperature of similar to 18 MK. The hot Fe XXIV. 192.03 angstrom. line exhibits very large nonthermal velocities up to 200 km s(-1) in the current sheet, suggesting that turbulent motions exist there. The largest turbulent velocity occurs at the edge of the current sheet, with some offset with the strongest line intensity. At the central part of the current sheet, the turbulent velocity is negatively correlated with the line intensity. From the line emission and turbulent features we obtain a thickness in the range of 7-11 Mm for the current sheet. These results suggest that the current sheet has internal fine and dynamic structures that may help the magnetic reconnection within it proceed efficiently.

Keywordline: profiles magnetic reconnection Sun: flares Sun: UV radiation
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000423333500004
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Cited Times:23[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorLi, Y.
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210034, Jiangsu, Peoples R China
2.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210023, Jiangsu, Peoples R China
3.Natl Astron Observ, CAS Key Lab Solar Act, Beijing 100012, Peoples R China
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GB/T 7714
Li, Y.,Xue, J. C.,Ding, M. D.,et al. Spectroscopic Observations of a Current Sheet in a Solar Flare[J]. ASTROPHYSICAL JOURNAL LETTERS,2018,853(1):9.
APA Li, Y..,Xue, J. C..,Ding, M. D..,Cheng, X..,Su, Y..,...&Gan, W. Q..(2018).Spectroscopic Observations of a Current Sheet in a Solar Flare.ASTROPHYSICAL JOURNAL LETTERS,853(1),9.
MLA Li, Y.,et al."Spectroscopic Observations of a Current Sheet in a Solar Flare".ASTROPHYSICAL JOURNAL LETTERS 853.1(2018):9.
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