EVOLUTION OF MAGNETIC HELICITY AND ENERGY SPECTRA OF SOLAR ACTIVE REGIONS
文献类型：期刊论文
| 作者 | Zhang, Hongqi1 ; Brandenburg, Axel2,3,4,5,6,7; Sokoloff, D. D.8,9
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2016-03-10 |
| 卷号 | 819期号:2 |
| 关键词 | Sun: activity dynamo Sun: magnetic fields Sun: photosphere |
| 英文摘要 | We adopt an isotropic representation of the Fourier-transformed two-point correlation tensor of the magnetic field to estimate the magnetic energy and helicity spectra as well as current helicity spectra of two individual active regions (NOAA. 11158 and NOAA. 11515) and the change of the spectral indices during their development as well as during the solar cycle. The departure of the spectral indices of magnetic energy and current helicity from 5/ 3 are analyzed, and it is found that it is lower than the spectral index of the magnetic energy spectrum. Furthermore, the fractional magnetic helicity tends to increase when the scale of the energy-carrying magnetic structures increases. The magnetic helicity of NOAA. 11515 violates the expected hemispheric sign rule, which is interpreted as an effect of enhanced field strengths at scales larger than 30-60Mm with opposite signs of helicity. This is consistent with the general cycle dependence, which shows that around the solar maximum the magnetic energy and helicity spectra are steeper, emphasizing the large-scale field. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000372305700058 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5409]  |
| 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, Key Lab Solar Act, Beijing 100012, Peoples R China 2.KTH Royal Inst Technol, NORDITA, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden 3.Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden 4.Stockholm Univ, AlbaNova Univ Ctr, Dept Astron, SE-10691 Stockholm, Sweden 5.Univ Colorado, JILA, Boulder, CO 80303 USA 6.Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80303 USA 7.Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80303 USA 8.Moscow MV Lomonosov State Univ, Dept Phys, Moscow 119992, Russia 9.Russian Acad Sci, Pushkov Inst Terr Magnetism Ionosphere & Radiowav, Moscow 142190, Russia |
| 推荐引用方式 GB/T 7714 | Zhang, Hongqi,Brandenburg, Axel,Sokoloff, D. D.. EVOLUTION OF MAGNETIC HELICITY AND ENERGY SPECTRA OF SOLAR ACTIVE REGIONS[J]. ASTROPHYSICAL JOURNAL,2016,819(2). |
| APA | Zhang, Hongqi,Brandenburg, Axel,&Sokoloff, D. D..(2016).EVOLUTION OF MAGNETIC HELICITY AND ENERGY SPECTRA OF SOLAR ACTIVE REGIONS.ASTROPHYSICAL JOURNAL,819(2). |
| MLA | Zhang, Hongqi,et al."EVOLUTION OF MAGNETIC HELICITY AND ENERGY SPECTRA OF SOLAR ACTIVE REGIONS".ASTROPHYSICAL JOURNAL 819.2(2016). |
入库方式： OAI收割
来源：国家天文台
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