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Signatures of Magnetic Reconnection at the Footpoints of Fan-shaped Jets on a Light Bridge Driven by Photospheric Convective Motions
Bai, Xianyong1,2; Socas-Navarro, Hector3,4; Nobrega-Siverio, Daniel5,6; Su, Jiangtao1,2; Deng, Yuanyong1,2; Li, Dong7,8; Cao, Wenda9; Ji, Kaifan10
2019-01-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume870Issue:2Pages:12
Corresponding AuthorBai, Xianyong(xybai@bao.ac.cn)
AbstractDynamical jets are generally found on light bridges (LBs), which are key to studying sunspot decay. So far, their formation mechanism is not fully understood. In this paper, we used state-of-the-art observations from the Goode Solar Telescope, the Interface Region Imaging Spectrograph, the Spectro-polarimeter on board Hinode, and the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory to analyze the fan-shaped jets on LBs in detail. A continuous upward motion of the jets in the ascending phase is found from the H alpha velocity that lasts for 12 minutes and is associated with the H alpha line wing enhancements. Two mini jets appear on the bright fronts of the fan-shaped jets visible in the AIA 171 and 193 angstrom channels, with a time interval as short as 1 minute. Two kinds of small-scale convective motions are identified in the photospheric images, along with the H alpha line wing enhancements. One seems to be associated with the formation of a new convection cell, and the other manifests as the motion of a dark lane passing through the convection cell. The finding of three-lobe Stokes V profiles and their inversion with the NICOLE code indicate that there are magnetic field lines with opposite polarities in LBs. From the H alpha - 0.8 angstrom images, we found ribbon-like brightenings propagating along the LBs, possibly indicating slipping reconnection. Our observation supports the idea that the fan-shaped jets under study are caused by magnetic reconnection, and photospheric convective motions play an important role in triggering the magnetic reconnection.
Keywordmethods: observational Sun: activity Sun: atmosphere Sun: magnetic fields sunspots
DOI10.3847/1538-4357/aaf1d1
WOS KeywordHIGH-RESOLUTION ; SI IV ; FIELDS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000455820100036
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/19938
Collection中国科学院紫金山天文台
Corresponding AuthorBai, Xianyong
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, 20 Datun Rd, Beijing 100012, Peoples R China
2.Univ Chinese Acad Sci, Sch Astron & Space Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
3.Inst Astrofis Canarias, Via Lactea S-N, San Cristobal la Laguna, Tenerife, Spain
4.Univ La Laguna, Dept Astrophys, E-38200 San Cristobal la Laguna, Tenerife, Spain
5.Univ Oslo, Inst Theoret Astrophys, POB 1029, NO-0315 Oslo, Norway
6.Univ Oslo, Rosseland Ctr Solar Phys, POB 1029, NO-0315 Oslo, Norway
7.Chinese Acad Sci, Purple Mt Observ, 8 Yuanhua Rd, Nanjing 210034, Jiangsu, Peoples R China
8.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210034, Jiangsu, Peoples R China
9.New Jersey Inst Technol, Big Bear Solar Observ, Big Bear City, CA 92314 USA
10.Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Yunnan, Peoples R China
Recommended Citation
GB/T 7714
Bai, Xianyong,Socas-Navarro, Hector,Nobrega-Siverio, Daniel,et al. Signatures of Magnetic Reconnection at the Footpoints of Fan-shaped Jets on a Light Bridge Driven by Photospheric Convective Motions[J]. ASTROPHYSICAL JOURNAL,2019,870(2):12.
APA Bai, Xianyong.,Socas-Navarro, Hector.,Nobrega-Siverio, Daniel.,Su, Jiangtao.,Deng, Yuanyong.,...&Ji, Kaifan.(2019).Signatures of Magnetic Reconnection at the Footpoints of Fan-shaped Jets on a Light Bridge Driven by Photospheric Convective Motions.ASTROPHYSICAL JOURNAL,870(2),12.
MLA Bai, Xianyong,et al."Signatures of Magnetic Reconnection at the Footpoints of Fan-shaped Jets on a Light Bridge Driven by Photospheric Convective Motions".ASTROPHYSICAL JOURNAL 870.2(2019):12.
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