Periodicity of Twisting Motions in Sunspot Penumbral Filaments
文献类型：期刊论文
| 作者 | Ning, Zongjun1 ; Cao, Wenda2; Goode, Philip R.2
|
| 刊名 | SOLAR PHYSICS
 |
| 出版日期 | 2009-07-01 |
| 卷号 | 257期号:2页码:251-260 |
| 关键词 | Sunspot Dynamics |
| ISSN号 | 0038-0938 |
| 英文摘要 | We study the periodicity of twisting motions in sunspot penumbral filaments, which were recently discovered from space (Hinode) and ground-based (SST) observations. A sunspot was well observed for 97 minutes by Hinode/SOT in the G-band (4305 ) on 12 November 2006. By the use of the time -aEuro parts per thousand space gradient applied to intensity space -aEuro parts per thousand time plots, twisting structures can be identified in the penumbral filaments. Consistent with previous findings, we find that the twisting is oriented from the solar limb to disk center. Some of them show a periodicity. The typical period is about a parts per thousand aEuro parts per thousand four minutes, and the twisting velocity is roughly 6 km s(-1). However, the penumbral filaments do not always show periodic twisting motions during the time interval of the observations. Such behavior seems to start and stop randomly with various penumbral filaments displaying periodic twisting during different intervals. The maximum number of periodic twists is 20 in our observations. Studying this periodicity can help us to understand the physical nature of the twisting motions. The present results enable us to determine observational constraints on the twisting mechanism. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | SOLAR OPTICAL TELESCOPE ; MISSION |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000267111100003 |
| 公开日期 | 2011-12-08 |
| 源URL | [http://159.226.72.40/handle/332002/1541]  |
| 专题 | 紫金山天文台_太阳活动的多波段观测研究团组 |
| 作者单位 | 1.Purple Mt Observ, Nanjing 210093, Peoples R China 2.New Jersey Inst Technol, Ctr Solar Terr Res, Newark, NJ 07102 USA |
| 推荐引用方式 GB/T 7714 | Ning, Zongjun,Cao, Wenda,Goode, Philip R.. Periodicity of Twisting Motions in Sunspot Penumbral Filaments[J]. SOLAR PHYSICS,2009,257(2):251-260. |
| APA | Ning, Zongjun,Cao, Wenda,&Goode, Philip R..(2009).Periodicity of Twisting Motions in Sunspot Penumbral Filaments.SOLAR PHYSICS,257(2),251-260. |
| MLA | Ning, Zongjun,et al."Periodicity of Twisting Motions in Sunspot Penumbral Filaments".SOLAR PHYSICS 257.2(2009):251-260. |
入库方式： OAI收割
来源：紫金山天文台
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