EFFECTS OF THE SCATTER IN SUNSPOT GROUP TILT ANGLES ON THE LARGE-SCALE MAGNETIC FIELD AT THE SOLAR SURFACE
文献类型：期刊论文
| 作者 | Jiang, J.1 ; Cameron, R. H.2; Schuessler, M.2
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2014-08-10 |
| 卷号 | 791期号:1 |
| 关键词 | Sun: activity Sun: magnetic fields Sun: photosphere sunspots |
| 英文摘要 | The tilt angles of sunspot groups represent the poloidal field source in Babcock-Leighton-type models of the solar dynamo and are crucial for the build-up and reversals of the polar fields in surface flux transport (SFT) simulations. The evolution of the polar field is a consequence of Hale's polarity rules, together with the tilt angle distribution which has a systematic component (Joy's law) and a random component (tilt-angle scatter). We determine the scatter using the observed tilt angle data and study the effects of this scatter on the evolution of the solar surface field using SFT simulations with flux input based upon the recorded sunspot groups. The tilt angle scatter is described in our simulations by a random component according to the observed distributions for different ranges of sunspot group size (total umbral area). By performing simulations with a number of different realizations of the scatter we study the effect of the tilt angle scatter on the global magnetic field, especially on the evolution of the axial dipole moment. The average axial dipole moment at the end of cycle 17 (a medium-amplitude cycle) from our simulations was 2.73 G. The tilt angle scatter leads to an uncertainty of 0.78 G (standard deviation). We also considered cycle 14 (a weak cycle) and cycle 19 (a strong cycle) and show that the standard deviation of the axial dipole moment is similar for all three cycles. The uncertainty mainly results from the big sunspot groups which emerge near the equator. In the framework of Babcock-Leighton dynamo models, the tilt angle scatter therefore constitutes a significant random factor in the cycle-to-cycle amplitude variability, which strongly limits the predictability of solar activity. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000339657700005 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6407]  |
| 专题 | 国家天文台_太阳物理研究部 |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Solar Act, Natl Astron Observ, Beijing 100012, Peoples R China 2.Max Planck Inst Sonnensyst Forsch, D-37077 Gottingen, Germany |
| 推荐引用方式 GB/T 7714 | Jiang, J.,Cameron, R. H.,Schuessler, M.. EFFECTS OF THE SCATTER IN SUNSPOT GROUP TILT ANGLES ON THE LARGE-SCALE MAGNETIC FIELD AT THE SOLAR SURFACE[J]. ASTROPHYSICAL JOURNAL,2014,791(1). |
| APA | Jiang, J.,Cameron, R. H.,&Schuessler, M..(2014).EFFECTS OF THE SCATTER IN SUNSPOT GROUP TILT ANGLES ON THE LARGE-SCALE MAGNETIC FIELD AT THE SOLAR SURFACE.ASTROPHYSICAL JOURNAL,791(1). |
| MLA | Jiang, J.,et al."EFFECTS OF THE SCATTER IN SUNSPOT GROUP TILT ANGLES ON THE LARGE-SCALE MAGNETIC FIELD AT THE SOLAR SURFACE".ASTROPHYSICAL JOURNAL 791.1(2014). |
入库方式： OAI收割
来源：国家天文台
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