OSCILLATIONS IN A SUNSPOT WITH LIGHT BRIDGES
文献类型：期刊论文
| 作者 | Yuan, Ding1,2,3; Nakariakov, Valery M.4,5,6; Huang, Zhenghua2; Li, Bo2; Su, Jiangtao1 ; Yan, Yihua1; Tan, Baolin1
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2014-09-01 |
| 卷号 | 792期号:1 |
| 关键词 | magnetohydrodynamics (MHD) Sun: atmosphere Sun: chromosphere Sun: oscillations sunspots waves |
| 英文摘要 | The Solar Optical Telescope on board Hinode observed a sunspot (AR 11836) with two light bridges (LBs) on 2013 August 31. We analyzed a two-hour Ca II H emission intensity data set and detected strong five-minute oscillation power on both LBs and in the inner penumbra. The time-distance plot reveals that the five-minute oscillation phase does not vary significantly along the thin bridge, indicating that the oscillations are likely to originate from underneath it. The slit taken along the central axis of the wide LB exhibits a standing wave feature. However, at the center of the wide bridge, the five-minute oscillation power is found to be stronger than at its sides. Moreover, the time-distance plot across the wide bridge exhibits a herringbone pattern that indicates a counter-stream of two running waves, which originated at the bridge's sides. Thus, the five-minute oscillations on the wide bridge also resemble the properties of running penumbral waves. The five-minute oscillations are suppressed in the umbra, while the three-minute oscillations occupy all three cores of the sunspot's umbra, separated by the LBs. The three-minute oscillations were found to be in phase at both sides of the LBs. This may indicate that either LBs do not affect umbral oscillations, or that umbral oscillations at different umbral cores share the same source. It also indicates that LBs are rather shallow objects situated in the upper part of the umbra. We found that umbral flashes (UFs) follow the life cycles of umbral oscillations with much larger amplitudes. They cannot propagate across LBs. UFs dominate the three-minute oscillation power within each core; however, they do not disrupt the phase of umbral oscillation. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000341172100041 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6632]  |
| 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.Shandong Univ, Sch Space Sci & Phys, Weihai 246209, Peoples R China 3.Katholieke Univ Leuven, Ctr Math Plasma Astrophys, Dept Math, B-3001 Leuven, Belgium 4.Univ Warwick, Ctr Fus Space & Astrophys, Dept Phys, Coventry CV4 7AL, W Midlands, England 5.Kyung Hee Univ, Sch Space Res, Yongin 446701, Gyeonggi, South Korea 6.Russian Acad Sci Pulkovo, Cent Astron Observ, St Petersburg 196140, Russia |
| 推荐引用方式 GB/T 7714 | Yuan, Ding,Nakariakov, Valery M.,Huang, Zhenghua,et al. OSCILLATIONS IN A SUNSPOT WITH LIGHT BRIDGES[J]. ASTROPHYSICAL JOURNAL,2014,792(1). |
| APA | Yuan, Ding.,Nakariakov, Valery M..,Huang, Zhenghua.,Li, Bo.,Su, Jiangtao.,...&Tan, Baolin.(2014).OSCILLATIONS IN A SUNSPOT WITH LIGHT BRIDGES.ASTROPHYSICAL JOURNAL,792(1). |
| MLA | Yuan, Ding,et al."OSCILLATIONS IN A SUNSPOT WITH LIGHT BRIDGES".ASTROPHYSICAL JOURNAL 792.1(2014). |
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来源：国家天文台
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