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The Dynamics of AR 12700 in Its Early Emerging Phase. II. Fan-shaped Activities Relevant to Arch Filament Systems
Zhong,Sihui1,2; Hou,Yijun1,2; Li,Leping1,2; Zhang,Jun1,2; Xiang,Yongyuan3
2019-09-09
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume882Issue:2
AbstractAbstract The emergence of active regions (ARs) closely relates to the solar dynamo and dynamical atmospheric phenomena. With high-resolution and long-lasting observations from the New Vacuum Solar Telescope, we report a new dynamic activity phenomenon named “fan-shaped activity (FSA)” in the emerging phase of NOAA AR 12700. The FSAs are clearly observed at Hα wavelengths and are closely related to the dynamics of the adjacent arch filament system (AFS), including thread deformation and material downward motions. On 2018 February 26, the two most representative FSAs appeared around 05:21 UT and 06:03 UT, respectively, and they first ascended and then decayed within around 10 minutes. At the ascending phase, accompanied by the uplifting of an adjacent AFS, each FSA launches up at one end of the AFS and extends for up to ~11 Mm. At the decaying phase, the FSA gradually vanishes, and material downflows toward the other end of the AFS are detected. After checking the evolution of the magnetic fields of AR 12700, we find that each FSA is located between the end of an AFS and an adjacent magnetic patch with the same polarity and launches at the onset of the collision and compression between these two magnetic patches. We propose that the collision lifts up the AFS, and then the initially compact AFS laterally expands, resulting in the formation of FSA. A cartoon model is proposed to depict the activities.
KeywordSun: activity Sun: atmosphere Sun: chromosphere Sun: evolution Sun: magnetic fields
DOI10.3847/1538-4357/ab345c
Language英语
WOS IDIOP:0004-637X-882-2-ab345c
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/28369
Collection中国科学院国家天文台
Affiliation1.CAS Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People's Republic of China zsh@nao.cas.cn, zjun@nao.cas.cn
2.University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
3.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, People's Republic of China
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zhong,Sihui,Hou,Yijun,Li,Leping,et al. The Dynamics of AR 12700 in Its Early Emerging Phase. II. Fan-shaped Activities Relevant to Arch Filament Systems[J]. The Astrophysical Journal,2019,882(2).
APA Zhong,Sihui,Hou,Yijun,Li,Leping,Zhang,Jun,&Xiang,Yongyuan.(2019).The Dynamics of AR 12700 in Its Early Emerging Phase. II. Fan-shaped Activities Relevant to Arch Filament Systems.The Astrophysical Journal,882(2).
MLA Zhong,Sihui,et al."The Dynamics of AR 12700 in Its Early Emerging Phase. II. Fan-shaped Activities Relevant to Arch Filament Systems".The Astrophysical Journal 882.2(2019).
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