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Spectroscopic Observations of a Current Sheet in a Solar Flare
Li, Y.; Xue, J. C.; Ding, M. D.; Cheng, X.; Su, Y.; Feng, L.; Hong, J.; Li, H.; Gan, W. Q.
2018
发表期刊ASTROPHYSICAL JOURNAL LETTERS
卷号853期号:1页码:L15
摘要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.
语种英语
WOS记录号WOS:000423333500004
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文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/18039
专题太阳高能及相关物理过程研究团组
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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):L15.
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),L15.
MLA Li, Y.,et al."Spectroscopic Observations of a Current Sheet in a Solar Flare".ASTROPHYSICAL JOURNAL LETTERS 853.1(2018):L15.
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