On the Relation Between Coronal Green Line Brightness and Magnetic Fields Intensity
文献类型:期刊论文
作者 | Zhang XF(张雪飞)2,3![]() ![]() ![]() ![]() ![]() ![]() ![]() |
刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
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出版日期 | 2022-07-01 |
卷号 | 22期号:7 |
关键词 | Sun: magnetic fields Sun: corona Stars: coronae Sun: activity Sun: atmosphere Sun: coronal mass ejections (CMEs) Sun: fundamental parameters Sun: heliosphere Sun: UV radiation |
ISSN号 | 1674-4527 |
DOI | 10.1088/1674-4527/ac6fb8 |
产权排序 | 第1完成单位 |
文献子类 | Article |
英文摘要 | Two-dimensional (2D) solar coronal magnetogram is difficult to be measured directly until now. From the previous knowledge, a general relation has been noticed that the brighter green-line brightness for corona, the higher coronal magnetic field intensity may correspond to. To try to further reveal the relationship between coronal green line brightness and magnetic field intensity, we use the 2D coronal images observed by Yunnan Observatories Green-line Imaging System (YOGIS) of the 10 cm Lijiang coronagraph and the coronal magnetic field maps calculated from the current-free extrapolations with the photospheric magnetograms taken by Helioseismic and Magnetic Imager (HMI) on board the Solar Dynamics Observatory (SDO) spacecraft. In our analysis, we identified the coronal loop structures and construct two-dimensional maps of the corresponding magnetic field intensity in the plane of the sky (POS) above the limb. We derive the correlation coefficients between the coronal brightness and the magnetic field intensity for different heights of coronal layers. We further use a linear combination of a Gaussian and a quadratic profile to fit the correlation coefficients distribution, finding a largest correlation coefficient of 0.82 near 1.1 R (circle dot) (solar radii) where is almost the top of the closed loop system. For the small closed loop system identified, the correlation coefficient distributions crossing and covering the loop are calculated. We also investigate the correlation with extended heliocentric latitude zones and long period of one whole Carrington Rotation, finding again that the maximum correlation coefficient occurs at the same height. It is the first time for us to find that the correlation coefficients are high (all are larger than 0.8) at the loop-tops and showing poor correlation coefficients with some fluctuations near the feet of the coronal loops. Our findings indicate that, for the heating of the low-latitude closed loops, both DC (dissipation of currents) and AC (dissipation of Alfven and magnetosonic waves) mechanisms should act simultaneously on the whole closed loop system while the DC mechanisms dominate in the loop-top regions. Therefore, in the distributions of the correlation coefficients with different heights of coronal layers, for both large- and small-scale latitude ranges, the coefficients can reach their maximum values at the same coronal height of 1.1 R (circle dot), which may indicate the particular importance of the height of closed loops for studying the coupling of the local emission mechanism and the coronal magnetic fields, which maybe helpful for studying the origin of the low-speed solar wind. |
学科主题 | 天文学 ; 太阳与太阳系 ; 太阳物理学 |
URL标识 | 查看原文 |
出版地 | 20A DATUN RD, CHAOYANG, BEIJING, 100012, PEOPLES R CHINA |
WOS关键词 | TOTAL SOLAR ECLIPSE ; IMAGING POLARIMETRY ; INDUCED TRANSITION ; TEMPERATURE ; DENSITY ; SYSTEM |
资助项目 | National Natural Science Foundation of China[11873090] ; National Natural Science Foundation of China[12173086] ; National Natural Science Foundation of China[11873092] ; National Natural Science Foundation of China[U2031148] ; CAS Light of West China Program |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
WOS记录号 | WOS:000811850300001 |
出版者 | NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES |
资助机构 | National Natural Science Foundation of China[11873090, 12173086, 11873092, U2031148] ; CAS Light of West China Program |
版本 | 出版稿 |
源URL | [http://ir.ynao.ac.cn/handle/114a53/25218] ![]() |
专题 | 云南天文台_选址与日冕观测组 |
通讯作者 | Zhang XF(张雪飞) |
作者单位 | 1.Yunnan Normal University, School of Physics and Electronic Information, Kunming 650000, China 2.University of Chinese Academy of Sciences, Beijing 100049, China; lyu@ynao.ac.cn; 3.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China; zhangxuefei@ynao.ac.cn; |
推荐引用方式 GB/T 7714 | Zhang XF,Liu Y,Zhao MY,et al. On the Relation Between Coronal Green Line Brightness and Magnetic Fields Intensity[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2022,22(7). |
APA | Zhang XF.,Liu Y.,Zhao MY.,Song TF.,Wang JX.,...&Li ZH.(2022).On the Relation Between Coronal Green Line Brightness and Magnetic Fields Intensity.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,22(7). |
MLA | Zhang XF,et al."On the Relation Between Coronal Green Line Brightness and Magnetic Fields Intensity".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 22.7(2022). |
入库方式: OAI收割
来源:云南天文台
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