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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
Source PublicationASTROPHYSICAL JOURNAL LETTERS
Volume735Issue:2
AbstractWe 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.
KeywordSun: Activity Sun: Chromosphere Sun: Corona Planets And Satellites: Magnetic Fields
DOI10.1088/2041-8205/735/2/L43
Indexed BySCI
Language英语
WOS IDWOS:000293138000019
Citation statistics
Cited Times:73[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/7931
Collection太阳物理研究部
Affiliation1.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
Recommended Citation
GB/T 7714
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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