Tracking moving magnetic features in the photosphere
文献类型：期刊论文
| 作者 | Li XiaoBo1,2; Buechner, Joerg2; Zhang HongQi1
|
| 刊名 | SCIENCE IN CHINA SERIES G-PHYSICS MECHANICS & ASTRONOMY
 |
| 出版日期 | 2009-11-01 |
| 卷号 | 52期号:11页码:1737-1748 |
| 关键词 | sun activity magnetic fields photosphere sunspots moat moving magnetic features |
| 英文摘要 | This research alms for an objective identification, tracking, and a statistical analysis of the Moving Magnetic Features (MMFs) around sunspots using SOHO/MDI high-resolution magnetograms. To this end, we develop a computerized tracking program and study the motion and magnetism of the outflows of MMFs around 26 sunspots. Our method locates 4-27 MMFs per hour, with higher counts for large sunspots. We differentiate MMFs into type alpha that have a polarity opposite to the parent sunspots, and type beta that share the sunspot's polarity. These sunspots' MMF subsets exhibit a wide range of central tendencies which have distinctive correlations with the sunspots. In general, alpha-MMFs emerge farther from the sunspot, carry less flux, and move faster than beta-MMFs. The typical alpha/beta-MMFs emerge at 2.2 - 8.1/0.1 - 3.2 Mm outside the penumbra limb, with lifetimes of 1.1 - 3.1/1.3 - 2.0 h. They are 1.1 - 6.6/1.4 - 3.6 Mm(2) in area and carry 1.4 - 12.5/4.8 - 11.4 x 10(18) Mx of flux. They travel a distance of 2.7 - 5.9/2.8 - 3.6 Mm with the speed of 0.5 - 0.9/0.4 - 0.7 km/s. Compared to the alpha-MMFs produced by large sunspots, those of small spots are smaller. They emerge closer to sunspot, move farther, live longer, and carry less flux. beta-MMFs show much less correlation with the sunspots. The flux outflow carried by the MMFs ranges from 0.2 to 8.3 x 10(19)Mx.h(-1) and does not show obvious correlation with the sunspots' evolution. The frequency distributions of the MMFs' distance traveled, area, and flux are exponential. This suggests the existence of numerous small, weak, and short-timescale magnetic objects which might contribute to the sunspot flux outflow. |
| 收录类别 | SCI ; ISTP |
| 语种 | 英语 |
| WOS记录号 | WOS:000271718600018 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7483]  |
| 专题 | 国家天文台_太阳物理研究部 |
| 作者单位 | 1.Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China 2.Max Planck Inst Sonnensyst Forsch, D-37191 Katlenburg Lindau, Germany |
| 推荐引用方式 GB/T 7714 | Li XiaoBo,Buechner, Joerg,Zhang HongQi. Tracking moving magnetic features in the photosphere[J]. SCIENCE IN CHINA SERIES G-PHYSICS MECHANICS & ASTRONOMY,2009,52(11):1737-1748. |
| APA | Li XiaoBo,Buechner, Joerg,&Zhang HongQi.(2009).Tracking moving magnetic features in the photosphere.SCIENCE IN CHINA SERIES G-PHYSICS MECHANICS & ASTRONOMY,52(11),1737-1748. |
| MLA | Li XiaoBo,et al."Tracking moving magnetic features in the photosphere".SCIENCE IN CHINA SERIES G-PHYSICS MECHANICS & ASTRONOMY 52.11(2009):1737-1748. |
入库方式： OAI收割
来源：国家天文台
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