Helicity comparison among three magnetographs
文献类型：期刊论文
| 作者 | Xu, Haiqing1 ; Gao, Yu1; Zhang, Hongqi1; Sakurai, T.2; Pevtsov, A. A.3; Sokoloff, D.4
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| 刊名 | ADVANCES IN SPACE RESEARCH
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| 出版日期 | 2007 |
| 卷号 | 39期号:11页码:1715-1722 |
| 关键词 | Sun : magnetic fields Sun : current helicity |
| 英文摘要 | We compare vector magnetograms of 228 active regions observed by Solar Magnetic Field Telescope (SMFT) at Huairou (HR) Solar Observing Station and the Solar Flare Telescope (SFT) at Mitaka (MTK) of the National Astronomical Observatory of Japan from 1992 to 2005 and 55 active regions observed by SFT and Haleakala Stokes Polarimeter (HSP) at Mees Solar Observatory, University of Hawaii from 1997 to 2000. Two helicity parameters, current helicity density h(c) and alpha(ff) coefficient of linear force free field are calculated. From this comparison we conclude: (1) the mean azimuthal angle differences of transverse fields between HR and MTK data are systematic smaller than that between MTK and Mees data; (2) there are 83.8% of h(c) and 78.1% of alpha(ff) for 228 active regions observed at HR and MTK agree in sign, and the Pearson linear correlation coefficient between these two data sets is 0.72 for h(c) and 0.56 for alpha(ff). There are 61.8% of h(c) an\d 58.2% of alpha(ff) for 55 active regions observed at MTK and Mees agree in sign, and the Pearson linear correlation coefficient between these two data sets is 0.34 for h(c) and 0.31 for alpha(ff); (3) there is a basic agreement on time variation of helicity parameters in active regions observed at HR, Mees, and MTK. (c) 2007 COSPAR. Published by Elsevier Ltd. All rights reserved. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000253588800007 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7302]  |
| 专题 | 国家天文台_太阳物理研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Natl Astron Observ, Tokyo 181, Japan 3.Natl Solar Observ, Sunspot, NM 88349 USA 4.Moscow MV Lomonosov State Univ, Dept Phys, Moscow 119992, Russia |
| 推荐引用方式 GB/T 7714 | Xu, Haiqing,Gao, Yu,Zhang, Hongqi,et al. Helicity comparison among three magnetographs[J]. ADVANCES IN SPACE RESEARCH,2007,39(11):1715-1722. |
| APA | Xu, Haiqing,Gao, Yu,Zhang, Hongqi,Sakurai, T.,Pevtsov, A. A.,&Sokoloff, D..(2007).Helicity comparison among three magnetographs.ADVANCES IN SPACE RESEARCH,39(11),1715-1722. |
| MLA | Xu, Haiqing,et al."Helicity comparison among three magnetographs".ADVANCES IN SPACE RESEARCH 39.11(2007):1715-1722. |
入库方式： OAI收割
来源：国家天文台
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