Dynamics of Descending Knots in a Solar Prominence and Their Possible Contributions to the Heating of the Local Corona
文献类型：期刊论文
| 作者 | Bi, Yi1,2,3; Yang, Bo1,2; Li, Ting3,4; Dong, Yan1,2; Ji, Kaifan1,2 |
| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
 |
| 出版日期 | 2020-03-10 |
| 卷号 | 891期号:2页码:10 |
| 关键词 | The Sun Solar prominences Solar chromosphere Solar coronal heating Solar corona Solar filaments Solar magnetic fields Solar physics |
| ISSN号 | 2041-8205 |
| DOI | 10.3847/2041-8213/ab79a2 |
| 英文摘要 | The knots in solar prominences are often observed to fall with nearly constant velocity, but the associated physical mechanism is currently not well understood. In this Letter, we present a prominence observed by the New Vacuum Solar Telescope in H-alpha wavelength. Knots that rose within the prominence appear to have been preferentially located at higher altitude, whereas those that fell were found throughout the entire prominence structure. The descending speed of the knots near the solar surface was higher than that far away from the solar surface. We noted that the knots near the solar surface may run along a set of coronal loops observed from the Atmospheric Imaging Assembly. Elsewhere, the majority of knots are interpreted to have descended across more horizontal magnetic fields with a nearly constant speed. This lack of acceleration indicates that the liberated gravitational potential energy may not manifest as an increase in kinetic energy. Assuming instead that the descending knots were capable of exciting Alfven waves that could then dissipate within the local corona, the gravitational potential energy of the knots may have been converted into thermal energy. Assuming a perfectly elastic system, we therefore estimate that the gravitational energy loss rate of these observed knots amounts to 1/2000 of that required to heat the entire quiet Sun, increasing to 1/320 when considering possibly further downward motions of the knots having disappeared in the H-alpha observations. This result suggests such a mechanism may contribute to the heating of the corona local to these prominences. |
| WOS关键词 | VERTICAL THREADS ; ENERGY ; EVOLUTION ; FLOWS |
| 资助项目 | Natural Science Foundation of China[11633008] ; Natural Science Foundation of China[11773072] ; Natural Science Foundation of China[11873027] ; Natural Science Foundation of China[11933009] ; Natural Science Foundation of China[11773039] ; Natural Science Foundation of China[11703084] ; Natural Science Foundation of China[11763004] ; Natural Science Foundation of China[11873088] ; Natural Science Foundation of China[U1831210] ; Young Elite Scientists Sponsorship Program by CAST ; National Key Research and Development Program of China[2019YFA0405000] ; CAS[QYZDJ-SSW-SLH012] ; Group for Innovation of Yunnan Province ; Key Laboratory of Solar Activity of Chinese Academy of Sciences[KLSA201710] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000521425000001 |
| 出版者 | IOP PUBLISHING LTD |
| 资助机构 | Natural Science Foundation of China ; Natural Science Foundation of China ; Young Elite Scientists Sponsorship Program by CAST ; Young Elite Scientists Sponsorship Program by CAST ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; CAS ; CAS ; Group for Innovation of Yunnan Province ; Group for Innovation of Yunnan Province ; Key Laboratory of Solar Activity of Chinese Academy of Sciences ; Key Laboratory of Solar Activity of Chinese Academy of Sciences ; Natural Science Foundation of China ; Natural Science Foundation of China ; Young Elite Scientists Sponsorship Program by CAST ; Young Elite Scientists Sponsorship Program by CAST ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; CAS ; CAS ; Group for Innovation of Yunnan Province ; Group for Innovation of Yunnan Province ; Key Laboratory of Solar Activity of Chinese Academy of Sciences ; Key Laboratory of Solar Activity of Chinese Academy of Sciences ; Natural Science Foundation of China ; Natural Science Foundation of China ; Young Elite Scientists Sponsorship Program by CAST ; Young Elite Scientists Sponsorship Program by CAST ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; CAS ; CAS ; Group for Innovation of Yunnan Province ; Group for Innovation of Yunnan Province ; Key Laboratory of Solar Activity of Chinese Academy of Sciences ; Key Laboratory of Solar Activity of Chinese Academy of Sciences ; Natural Science Foundation of China ; Natural Science Foundation of China ; Young Elite Scientists Sponsorship Program by CAST ; Young Elite Scientists Sponsorship Program by CAST ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; CAS ; CAS ; Group for Innovation of Yunnan Province ; Group for Innovation of Yunnan Province ; Key Laboratory of Solar Activity of Chinese Academy of Sciences ; Key Laboratory of Solar Activity of Chinese Academy of Sciences |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/55555]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Bi, Yi |
| 作者单位 | 1.Chinese Acad Sci, Yunnan Observ, 396 Yangfangwang, Kunming 650216, Yunnan, Peoples R China 2.Chinese Acad Sci, Ctr Astron Mega Sci, 20A Datun Rd, Beijing 100012, Peoples R China 3.Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China 4.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Bi, Yi,Yang, Bo,Li, Ting,et al. Dynamics of Descending Knots in a Solar Prominence and Their Possible Contributions to the Heating of the Local Corona[J]. ASTROPHYSICAL JOURNAL LETTERS,2020,891(2):10. |
| APA | Bi, Yi,Yang, Bo,Li, Ting,Dong, Yan,&Ji, Kaifan.(2020).Dynamics of Descending Knots in a Solar Prominence and Their Possible Contributions to the Heating of the Local Corona.ASTROPHYSICAL JOURNAL LETTERS,891(2),10. |
| MLA | Bi, Yi,et al."Dynamics of Descending Knots in a Solar Prominence and Their Possible Contributions to the Heating of the Local Corona".ASTROPHYSICAL JOURNAL LETTERS 891.2(2020):10. |
入库方式： OAI收割
来源：国家天文台
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