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题名: Observations of Multiple Blobs in Homologous Solar Coronal Jets in Closed Loop
作者: Zhang, Q. M.1; Ji, H. S.1; Su, Y. N.1
刊名: SOLAR PHYSICS
出版日期: 2016-03-01
卷号: 291, 期号:3, 页码:859-876
关键词: Flares ; microflares and nanoflares ; Magnetic reconnection ; observational signatures ; Jets
DOI: 10.1007/s11207-016-0878-1
文章类型: Article
英文摘要: Coronal bright points (CBPs) and jets are ubiquitous small-scale brightenings that are often associated with each other. We here report our multiwavelength observations of two groups of homologous jets. The first group was observed by the Extreme-Ultraviolet Imager (EUVI) onboard the Solar TErrestrial RElations Observatory (STEREO) Behind spacecraft in 171 and 304 on 2014 September 10, from a location where no data from the Solar Dynamic Observatory (SDO) could be obtained. The jets (J1 -aEuro parts per thousand J6) recurred for six times with intervals of 5 -aEuro parts per thousand 15 minutes. They originated from the same primary CBP (BP1) and propagated in the northeast direction along large-scale, closed coronal loops. Two of the jets (J3 and J6) produced sympathetic CBPs (BP2 and BP3) after reaching the remote footpoints of the loops. The time delays between the peak times of BP1 and BP2 (BP3) are (). The jets were not coherent. Instead, they were composed of bright and compact blobs. The sizes and apparent velocities of the blobs are 4.5 -aEuro parts per thousand 9 Mm and 140 -aEuro parts per thousand 380 km s(-1). The arrival times of the multiple blobs in the jets at the far end of the loops indicate that the sympathetic CBPs are caused by jet flows and not by thermal conduction fronts. The second group was observed by the Atmospheric Imaging Assembly onboard SDO in various wavelengths on 2010 August 3. Similar to the first group, the jets originated from a short-lived BP at the boundary of Active Region 11092 and propagated along a small-scale, closed loop before flowing into the active region. Several tiny blobs with sizes of and an apparent velocity of were identified in the jets. We carried out differential emission measure (DEM) inversions to investigate the temperatures of the blobs, finding that the blobs were multithermal with an average temperature of 1.8 -aEuro parts per thousand 3.1 MK. The estimated number densities of the blobs were (1.7- 2.8) x 10(9) cm(-3).
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: X-RAY JETS ; CHROMOSPHERIC ANEMONE JETS ; MOVING MAGNETIC FEATURES ; BRIGHT POINTS ; PLASMOID INSTABILITY ; PHYSICAL PARAMETERS ; RADIO OBSERVATIONS ; CURRENT SHEETS ; BLOWOUT JETS ; POLAR JETS
收录类别: SCI
项目资助者: NSFC(11303101 ; Strategic Priority Research Program-The Emergence of Cosmological Structures of the CAS(XDB09000000) ; Youth Fund of Jiangsu(BK20141043) ; Chinese Academy of Sciences ; 11333009 ; 11473071 ; 11573072)
语种: 英语
WOS记录号: WOS:000373232700008
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16180
Appears in Collections:太阳活动的多波段观测研究团组_期刊论文

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作者单位: 1.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Sci, Nanjing 210008, Jiangsu, Peoples R China
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