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VECTOR MAGNETIC FIELDS OF A SOLAR POLAR REGION
Jin, Chunlan; Wang, Jingxiu
2011-05-01
发表期刊ASTROPHYSICAL JOURNAL
卷号732期号:1
摘要We study the vector magnetic fields of a solar polar region (PR) based on Solar Optical Telescope/Spectro-Polarimeter measurements. To better understand the polar magnetic properties, we compare the observed polar field with that in two solar quiet regions at the limb (QRL) and the disk center (QRD), and with that in a region of a low-latitude coronal hole (CHR). The following results are discussed: (1) The average vertical flux density of PR is 16 G, while the average horizontal flux density is 91 G. If we assume that the observed polar field suffers the same amount of limb weakening in polarization measurements as the Sun's quiet region, the average unsigned flux density in the pole would be 54 G, 60% stronger than that in the CHR. (2) The kG field in the PR occupies 6.7% of the region. The magnetic filling factor in the PR is characterized by a two-peak distribution, which appears at a field strength close to 100 G and 1000 G, respectively. (3) For the network elements, a correlation holds between the vertical and horizontal flux densities, suggesting the same physical entity is manifested by the observed stronger vertical and horizontal components. (4) The ratio of the magnetic flux in the minority polarity to that in the dominant polarity is approximately 0.5, implying that only 1/3 of the magnetic flux in the PR opens to the interplanetary space. Exemplified with CHR by a quasi-linear force-free extrapolation of the observed magnetic field, we find that the photospheric open flux is not always associated with strong vertical magnetic elements.
关键词Solar Wind Sun: Chromosphere Sun: Corona Sun: Magnetic Topology Sun: Photosphere
DOI10.1088/0004-637X/732/1/4
收录类别SCI
语种英语
WOS记录号WOS:000289626500004
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文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/7848
专题射电天文研究部
作者单位Chinese Acad Sci, Key Lab Solar Act, Natl Astron Observ, Beijing 100012, Peoples R China
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Jin, Chunlan,Wang, Jingxiu. VECTOR MAGNETIC FIELDS OF A SOLAR POLAR REGION[J]. ASTROPHYSICAL JOURNAL,2011,732(1).
APA Jin, Chunlan,&Wang, Jingxiu.(2011).VECTOR MAGNETIC FIELDS OF A SOLAR POLAR REGION.ASTROPHYSICAL JOURNAL,732(1).
MLA Jin, Chunlan,et al."VECTOR MAGNETIC FIELDS OF A SOLAR POLAR REGION".ASTROPHYSICAL JOURNAL 732.1(2011).
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