EMERGING DIMMINGS OF ACTIVE REGIONS OBSERVED BY THE SOLAR DYNAMICS OBSERVATORY
文献类型：期刊论文
| 作者 | Zhang, Jun1 ; Yang, Shuhong1; Liu, Yang2; Sun, Xudong2
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| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
 |
| 出版日期 | 2012-12-01 |
| 卷号 | 760期号:2 |
| 关键词 | Sun: activity Sun: atmosphere Sun: photosphere Sun: surface magnetism |
| 英文摘要 | Using the observations from the Atmospheric Imaging Assembly and the Helioseismic and Magnetic Imager on board the Solar Dynamics Observatory, we statistically investigate the emerging dimmings (EDs) of 24 isolated active regions (IARs) from 2010 June to 2011 May. All the IARs show EDs in lower-temperature lines (e.g., 171 angstrom) at their early emerging stages. Meanwhile, in higher temperature lines (e.g., 211 angstrom), the ED regions brighten continuously. There are two types of EDs: fan-shaped and halo-shaped. There are 19 fan-shaped EDs and 5 halo-shaped ones. The EDs appear to be delayed by several to more than ten hours relative to the first emergence of the IARs. The shortest delay is 3.6 hr and the longest is 19.0 hr. The EDs last from 3.3 hr to 14.2 hr, with a mean duration of 8.3 hr. Before the appearance of the EDs, the emergence rate of the magnetic flux of the IARs is between 1.2 x 10(19) Mx hr(-1) to 1.4 x 10(20) Mx hr(-1). The larger the emergence rate is, the shorter the delay time is. While the dimmings appear, the magnetic flux of the IARs ranges from 8.8 x 10(19) Mx to 1.3 x 10(21) Mx. These observations imply that the reconfiguration of the coronal magnetic fields due to reconnection between the newly emerging flux and the surrounding existing fields results in a new thermal distribution which leads to a dimming for the cooler channel (171 angstrom) and brightening in the warmer channels. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000311103000010 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6172]  |
| 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.Stanford Univ, WW Hansen Expt Phys Lab, Stanford, CA 94305 USA |
| 推荐引用方式 GB/T 7714 | Zhang, Jun,Yang, Shuhong,Liu, Yang,et al. EMERGING DIMMINGS OF ACTIVE REGIONS OBSERVED BY THE SOLAR DYNAMICS OBSERVATORY[J]. ASTROPHYSICAL JOURNAL LETTERS,2012,760(2). |
| APA | Zhang, Jun,Yang, Shuhong,Liu, Yang,&Sun, Xudong.(2012).EMERGING DIMMINGS OF ACTIVE REGIONS OBSERVED BY THE SOLAR DYNAMICS OBSERVATORY.ASTROPHYSICAL JOURNAL LETTERS,760(2). |
| MLA | Zhang, Jun,et al."EMERGING DIMMINGS OF ACTIVE REGIONS OBSERVED BY THE SOLAR DYNAMICS OBSERVATORY".ASTROPHYSICAL JOURNAL LETTERS 760.2(2012). |
入库方式： OAI收割
来源：国家天文台
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