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Studies of Isolated and Non-isolated Photospheric Bright Points in an Active Region Observed by the New Vacuum Solar Telescope
Liu,Yanxiao1,2,3; Xiang,Yongyuan1,3; Erdélyi,Robertus4,5; Liu,Zhong1,3; Li,Dong6,7; Ning,Zongjun6,7; Bi,Yi1,2,3; Wu,Ning8; Lin,Jun1,3
2018-03-21
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume856Issue:1
AbstractAbstract Properties of photospheric bright points (BPs) near an active region have been studied in TiO λ 7058?? images observed by the New Vacuum Solar Telescope of the Yunnan Observatories. We developed a novel recognition method that was used to identify and track 2010 BPs. The observed evolving BPs are classified into isolated (individual) and non-isolated (where multiple BPs are observed to display splitting and merging behaviors) sets. About 35.1% of BPs are non-isolated. For both isolated and non-isolated BPs, the brightness varies from 0.8?to?1.3 times the average background intensity and follows a Gaussian distribution. The lifetimes of BPs follow a log-normal distribution, with characteristic lifetimes of (267?±?140)?s and (421?±?255)?s, respectively. Their size also follows log-normal distribution, with an average size of about (2.15?±?0.74)?×?104 km2 and (3.00?±?1.31)?× 104 km2 for area, and (163?±?27) km and (191?±?40) km for diameter, respectively. Our results indicate that regions with strong background magnetic field have higher BP number density and higher BP area coverage than regions with weak background field. Apparently, the brightness/size of BPs does not depend on the background field. Lifetimes in regions with strong background magnetic field are shorter than those in regions with weak background field, on average.
Keywordinstrumentation: high angular resolution methods: observational Sun: photosphere
DOI10.3847/1538-4357/aab150
Language英语
WOS IDIOP:0004-637X-856-1-aab150
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22404
Collection中国科学院紫金山天文台
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, Kunming, Yunnan 650216, People's Republic of China; jlin@ynao.ac.cn
2.University of Chinese Academy of Sciences, Beijing 100039, People's Republic of China
3.Center for Astronomical Mega-Science, Chinese Academy of Sciences, Beijing, 100012, People's Republic of China
4.Solar Physics and Space Plasma Research Centre (SP2RC), School of Mathematics and Statistics, The University of Sheffield, Hicks Building, Hounsfield Road, Sheffield S3 7RH, UK
5.Department of Astronomy, E?tv?s University, Pázmány P. sétány 1/A Budapest P.O. Box 32, H-1117, Hungary
6.Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, Jiangsu 210008, People's Republic of China
7.Key Laboratory of Dark Matter and Space Science, Chinese Academy of Science, Nanjing, Jiangsu 210008, People's Republic of China
8.School of Tourism and Geography, Yunnan Normal University, Kunming, Yunnan 650500, People's Republic of China
Recommended Citation
GB/T 7714
Liu,Yanxiao,Xiang,Yongyuan,Erdélyi,Robertus,et al. Studies of Isolated and Non-isolated Photospheric Bright Points in an Active Region Observed by the New Vacuum Solar Telescope[J]. The Astrophysical Journal,2018,856(1).
APA Liu,Yanxiao.,Xiang,Yongyuan.,Erdélyi,Robertus.,Liu,Zhong.,Li,Dong.,...&Lin,Jun.(2018).Studies of Isolated and Non-isolated Photospheric Bright Points in an Active Region Observed by the New Vacuum Solar Telescope.The Astrophysical Journal,856(1).
MLA Liu,Yanxiao,et al."Studies of Isolated and Non-isolated Photospheric Bright Points in an Active Region Observed by the New Vacuum Solar Telescope".The Astrophysical Journal 856.1(2018).
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