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EXPLOSIVE CHROMOSPHERIC EVAPORATION IN A CIRCULAR-RIBBON FLARE
Zhang, Q. M.; Li, D.; Ning, Z. J.; Su, Y. N.; Ji, H. S.; Guo, Y.
2016
发表期刊ASTROPHYSICAL JOURNAL
卷号827期号:1页码:27
摘要In this paper, we report our multiwavelength observations of the C4.2 circular-ribbon flare in active region (AR) 12434 on 2015 October 16. The short-lived flare was associated with positive magnetic polarities and a negative polarity inside, as revealed by the photospheric line-of-sight magnetograms. Such a magnetic pattern is strongly indicative of a magnetic null point and spine-fan configuration in the corona. The flare was triggered by the eruption of a mini-filament residing in the AR, which produced the inner flare ribbon (IFR) and the southern part of a closed circular flare ribbon (CFR). When the eruptive filament reached the null point, it triggered null point magnetic reconnection with the ambient open field and generated the bright CFR and a blowout jet. Raster observations of the Interface Region Imaging Spectrograph show plasma upflow at speeds of 35-120 km s(-1) in the Fe XXI lambda 1354.09 line (log T approximate to 7.05) and downflow at speeds of 10-60 km s(-1) in the Si IV lambda 1393.77 line (log T approximate to 4.8) at certain locations of the CFR and IFR during the impulsive phase of the flare, indicating explosive chromospheric evaporation. Coincidence of the single hard X-ray source at 12-25 keV with the IFR and calculation based on the thick-target model suggest that the explosive evaporation was most probably driven by nonthermal electrons.
DOI10.3847/0004-637X/827/1/27
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文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/16872
专题太阳高能及相关物理过程研究团组
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Zhang, Q. M.,Li, D.,Ning, Z. J.,et al. EXPLOSIVE CHROMOSPHERIC EVAPORATION IN A CIRCULAR-RIBBON FLARE[J]. ASTROPHYSICAL JOURNAL,2016,827(1):27.
APA Zhang, Q. M.,Li, D.,Ning, Z. J.,Su, Y. N.,Ji, H. S.,&Guo, Y..(2016).EXPLOSIVE CHROMOSPHERIC EVAPORATION IN A CIRCULAR-RIBBON FLARE.ASTROPHYSICAL JOURNAL,827(1),27.
MLA Zhang, Q. M.,et al."EXPLOSIVE CHROMOSPHERIC EVAPORATION IN A CIRCULAR-RIBBON FLARE".ASTROPHYSICAL JOURNAL 827.1(2016):27.
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