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KINEMATICS AND FINE STRUCTURE OF AN UNWINDING POLAR JET OBSERVED BY THE SOLAR DYNAMIC OBSERVATORY/ATMOSPHERIC IMAGING ASSEMBLY
Shen YD(申远灯)1,2,3; Liu Y(刘煜)1,3; Su, JT3,4; Ibrahim, A5; Shen, YD (reprint author), Chinese Acad Sci, Natl Astron Observ Yunnan Observ, Kunming 650011, Peoples R China.
发表期刊ASTROPHYSICAL JOURNAL LETTERS
2011-07-10
卷号735期号:2
DOI10.1088/2041-8205/735/2/L43
产权排序第1完成单位
收录类别SCI
关键词Sun: Activity Sun: Chromosphere Sun: Corona Planets And Satellites: Magnetic Fields
摘要We present an observational study of the kinematics and fine structure of an unwinding polar jet, with high temporal and spatial observations taken by the Atmospheric Imaging Assembly on board the Solar Dynamic Observatory and the Solar Magnetic Activity Research Telescope. During the rising period, the shape of the jet resembled a cylinder with helical structures on the surface, while the mass of the jet was mainly distributed on the cylinder's shell. In the radial direction, the jet expanded successively at its western side and underwent three distinct phases: the gradually expanding phase, the fast expanding phase, and the steady phase. Each phase lasted for about 12 minutes. The angular speed of the unwinding motion of the jet and the twist transferred into the outer corona during the eruption are estimated to be 11.1 x 10(-3) rad s(-1) (period = 564 s) and 1.17-2.55 turns (or 2.34-5.1 pi), respectively. On the other hand, by calculating the azimuthal component of the magnetic field in the jet and comparing the free energy stored in the non-potential magnetic field with the jet's total energy, we find that the non-potential magnetic field in the jet is enough to supply the energy for the ejection. These new observational results strongly support the scenario that the jets are driven by the magnetic twist, which is stored in the twisted closed field of a small bipole, and released through magnetic reconnection between the bipole and its ambient open field.
项目资助者NSFC [10933003, 11078004, 11073050] ; MOST [2011CB811400] ; Key Laboratory of Solar Activity of the National Astronomical Observatories of the Chinese Academy of Sciences [KLSA2011-14]
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN2041-8205
URL查看原文
归档日期2011-11-26
WOS记录号WOS:000293138000019
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]CORONAL MASS EJECTIONS ; EMERGING FLUX ; SURGE ; REGION
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/7176
专题选址与日冕观测组
通讯作者Shen, YD (reprint author), Chinese Acad Sci, Natl Astron Observ Yunnan Observ, Kunming 650011, Peoples R China.
作者单位1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China
2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China
3.Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Science, Beijing 100012, China
4.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
5.Physics and Astronomy Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
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GB/T 7714
Shen YD,Liu Y,Su, JT,et al. KINEMATICS AND FINE STRUCTURE OF AN UNWINDING POLAR JET OBSERVED BY THE SOLAR DYNAMIC OBSERVATORY/ATMOSPHERIC IMAGING ASSEMBLY[J]. ASTROPHYSICAL JOURNAL LETTERS,2011,735(2).
APA Shen YD,Liu Y,Su, JT,Ibrahim, A,&Shen, YD .(2011).KINEMATICS AND FINE STRUCTURE OF AN UNWINDING POLAR JET OBSERVED BY THE SOLAR DYNAMIC OBSERVATORY/ATMOSPHERIC IMAGING ASSEMBLY.ASTROPHYSICAL JOURNAL LETTERS,735(2).
MLA Shen YD,et al."KINEMATICS AND FINE STRUCTURE OF AN UNWINDING POLAR JET OBSERVED BY THE SOLAR DYNAMIC OBSERVATORY/ATMOSPHERIC IMAGING ASSEMBLY".ASTROPHYSICAL JOURNAL LETTERS 735.2(2011).
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