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题名: Bi-directional flows in a C-class solar flare
作者: Ning ZongJun(宁宗军)1, 2
刊名: ASTROPHYSICS AND SPACE SCIENCE
出版日期: 2016
卷号: 361, 期号:1
关键词: Sun ; Flares and Sun ; UV radiation and Sun ; X-ray bursts ; Hard
DOI: 10.1007/s10509-015-2606-y
文章类型: Article
英文摘要: We have explored the bi-directional flows in a C-class solar flare observed by Solar Dynamic Observatory Atmospheric Imaging Assembly (SDO/AIA) on 2012 December 26. This event occurs in a curved magnetic loop connecting a pair of negative and positive fields. The Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) observations show a X-ray source in 3-25 keV stayed at the loop top during the flare. High-cadence AIA observations exhibit many flows movement intermittently along the flare loop. In order to analyze these flows, firstly, the event is cut along the loop direction with a curved slit which is wide enough to include the bulk of ultraviolet (UV) and X-ray emissions. Secondly, after integration the flux along the slit width, we get the space-time slices at 9 AIA wavelengths and in RHESSI 3-25 keV. Thirdly, the derivative is done on the space-time slices. Many bi-directional flows are identified as the oblique streaks on the intensity-gradient space-time slices during the flare lifetime. They almost start from the same position near the loop top, where the X-ray emission is bright in 3-25 keV. Then they move toward the positive and the negative polarity footpoints simultaneously. Their average speed is directly measured about 230 km s(-1), and they exhibit a typical quasi-period of about 3 minutes. The characteristics of these flows, such as bi-directional, simultaneous, symmetrical and quasi-periodic, are the observational constraints for acceleration theories.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: 2003 NOVEMBER 3 ; X-RAY SOURCES ; MAGNETIC RECONNECTION ; PARTICLE-ACCELERATION ; ELECTRON-BEAMS ; CORONAL HARD ; RHESSI ; LOOP ; RADIO ; PHASE
收录类别: SCI
项目资助者: 973 project(2011CB811400 ; (11333009) ; (11573072) ; (2010DP173032) ; 2014CB744200)
语种: 英语
WOS记录号: WOS:000367516500022
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16100
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.Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China
2.Nanjing Univ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China
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