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Subarcsecond Blobs in Flare-related Coronal Jets
Zhang, Q. M.1; Ni, L.2,3
2019-01-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume870Issue:2Pages:9
Corresponding AuthorZhang, Q. M.(zhangqm@pmo.ac.cn)
AbstractIn this paper, we report multiwavelength observations of subarcsecond blobs in coronal jets. In AR 12149, a C5.5 circular-ribbon flare occurred at similar to 04:55 UT on 2014 August 24, which consisted of a discrete circular ribbon and a short inner ribbon inside. Two jets (jet1 and jet2) were related to the flare. Jet1 appeared first and experienced untwisting motion during its early propagation along a closed coronal loop. Jet2 appeared 6 minutes later and propagated upward along another closed loop. During its initial phase, a big plasmoid was ejected out of jet2 at a speed of similar to 150 km s(-1). After the flare peak time (05:02 UT), multiple bright and compact blobs appeared in the lower part of jet2, which were observed by the Slit-Jaw Imager (SJI) on board the Interface Region Imaging Spectrograph. The blobs observed by SJI in 1330 angstrom have sizes of 0.'' 45-1.'' 35, nearly 84% of which are subarcsecond (<1 ''). The mean value and standard deviation of the sizes are 0.'' 78 and 0.'' 19, respectively. The velocities of the blobs range from 10 to more than 220 km s(-1), some of which decelerate and disappear during the upward propagation. Three of the blobs had their counterparts in extreme-ultraviolet (EUV) wavelengths observed by the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory spacecraft. The velocities are almost identical in ultraviolet (UV) and EUV wavelengths. We propose that the blobs observed in 1330 angstrom are the cool component (similar to 0.025 MK), while the blobs observed in EUV are the hot component of several MK. In jet1, only one blob was present, with a size of similar to 1 '' and a velocity of similar to 40 km s(-1). We conclude that the blobs are created by the tearing-mode instability of the current sheet at the base or inside the coronal jets. Our results have important implications for uncovering the fine structures of coronal jets and understanding the relationship between the blobs observed at UV and EUV wavelengths.
KeywordSun: corona Sun: flares Sun: magnetic fields Sun: UV radiation
DOI10.3847/1538-4357/aaf391
WOS KeywordX-RAY JETS ; H-ALPHA SURGES ; MAGNETIC RECONNECTION ; SOLAR-FLARE ; FILAMENT ; EJECTION ; PULSATIONS ; HINODE ; SHEET
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000455991600007
PublisherIOP PUBLISHING LTD
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/19982
Collection中国科学院紫金山天文台
Corresponding AuthorZhang, Q. M.
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Sci, Nanjing 210034, Jiangsu, Peoples R China
2.Chinese Acad Sci, Yunnan Observat, 396 Yangfangwang, Kunming 650216, Yunnan, Peoples R China
3.Natl Astron Observatories, CAS Key Lab Solar Act, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Q. M.,Ni, L.. Subarcsecond Blobs in Flare-related Coronal Jets[J]. ASTROPHYSICAL JOURNAL,2019,870(2):9.
APA Zhang, Q. M.,&Ni, L..(2019).Subarcsecond Blobs in Flare-related Coronal Jets.ASTROPHYSICAL JOURNAL,870(2),9.
MLA Zhang, Q. M.,et al."Subarcsecond Blobs in Flare-related Coronal Jets".ASTROPHYSICAL JOURNAL 870.2(2019):9.
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