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KINEMATICS AND FINE STRUCTURE OF AN UNWINDING POLAR JET OBSERVED BY THE SOLAR DYNAMIC OBSERVATORY/ATMOSPHERIC IMAGING ASSEMBLY
Shen, Yuandeng1,2,3; Liu, Yu1,3; Su, Jiangtao3; Ibrahim, Ahmed4
2011-07-10
发表期刊ASTROPHYSICAL JOURNAL LETTERS
卷号735期号:2
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.
关键词Sun: Activity Sun: Chromosphere Sun: Corona Planets And Satellites: Magnetic Fields
DOI10.1088/2041-8205/735/2/L43
收录类别SCI
语种英语
WOS记录号WOS:000293138000019
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文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/7931
专题太阳物理研究部
作者单位1.Chinese Acad Sci, Natl Astron Observ Yunnan Observ, Kunming 650011, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Key Lab Solar Act, Natl Astron Observ, Beijing 100012, Peoples R China
4.King Saud Univ, Dept Phys & Astron, Coll Sci, Riyadh 11451, Saudi Arabia
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Shen, Yuandeng,Liu, Yu,Su, Jiangtao,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, Yuandeng,Liu, Yu,Su, Jiangtao,&Ibrahim, Ahmed.(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, Yuandeng,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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