OBSERVATIONS OF OPPOSITELY DIRECTED UMBRAL WAVEFRONTS ROTATING IN SUNSPOTS OBTAINED FROM THE NEW SOLAR TELESCOPE OF BBSO
文献类型：期刊论文
| 作者 | Su, J. T.1; Ji, K. F.2; Cao, W.3; Banerjee, D.4; Priya, T. G.1; Zhao, J. S.5; Bai, X. Y.1; Chen, J.1; Zhang, M.1; Ji, H. S.6 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2016-02-01 |
| 卷号 | 817期号:2 |
| 关键词 | Sun: chromosphere Sun: magnetic fields Sun: oscillations sunspots |
| 英文摘要 | We study the umbral waves as observed by chromospheric imaging observations of two sunspots with the New Solar Telescope at the Big Bear Solar Observatory. We find that the wavefronts (WFs) rotate clockwise and form a one-armed spiral structure in the first sunspot, whereas two-and three-armed structures arise in the second sunspot where the WFs rotate anticlockwise and clockwise alternately. All the spiral arms display propagation outwards and become running penumbral waves once they cross the umbral boundaries, suggesting that the umbral and penumbral waves propagate along the same inclined field lines. We propose that the one-armed spiral structure may be produced by the WF reflections at the chromospheric umbral light bridge, and the multi-armed spirals may be related to the twist of the magnetic field in the umbra. Additionally, the time lag of the umbral oscillations in between the data of He I 10830 angstrom and H alpha -0.4 angstrom is similar to 17 s, and it is similar to 60 s for that in between the data of 304 angstrom and H alpha - 0.4 angstrom. This indicates that these disturbances are slow magnetoacoustic waves in nature, and that they propagate upward along the inclined lines with fast radial expansions causing horizontal velocities of the running waves. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000369437900034 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5430]  |
| 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.Kunming Univ Sci & Technol, Kunming 650093, Peoples R China 3.Big Bear Solar Observ, 40386 North Shore Lane, Big Bear City, CA 92314 USA 4.Indian Inst Astrophys, Bangalore 560034, Karnataka, India 5.Chinese Acad Sci, Key Lab Planetary Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 6.Chinese Acad Sci, Key Lab Dark Matter & Space Sci, Purple Mt Observ, Nanjing 210008, Peoples R China |
| 推荐引用方式 GB/T 7714 | Su, J. T.,Ji, K. F.,Cao, W.,et al. OBSERVATIONS OF OPPOSITELY DIRECTED UMBRAL WAVEFRONTS ROTATING IN SUNSPOTS OBTAINED FROM THE NEW SOLAR TELESCOPE OF BBSO[J]. ASTROPHYSICAL JOURNAL,2016,817(2). |
| APA | Su, J. T..,Ji, K. F..,Cao, W..,Banerjee, D..,Priya, T. G..,...&Ji, H. S..(2016).OBSERVATIONS OF OPPOSITELY DIRECTED UMBRAL WAVEFRONTS ROTATING IN SUNSPOTS OBTAINED FROM THE NEW SOLAR TELESCOPE OF BBSO.ASTROPHYSICAL JOURNAL,817(2). |
| MLA | Su, J. T.,et al."OBSERVATIONS OF OPPOSITELY DIRECTED UMBRAL WAVEFRONTS ROTATING IN SUNSPOTS OBTAINED FROM THE NEW SOLAR TELESCOPE OF BBSO".ASTROPHYSICAL JOURNAL 817.2(2016). |
入库方式： OAI收割
来源：国家天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。