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Magnetic Reconnection at the Earliest Stage of Solar Flux Emergence
Tian, Hui1; Zhu, Xiaoshuai2,3; Peter, Hardi3; Zhao, Jie4; Samanta, Tanmoy1; Chen, Yajie1
2018-02-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume854Issue:2Pages:13
Abstract

On 2016 September 20, the Interface Region Imaging Spectrograph observed an active region during its earliest emerging phase for almost 7 hr. The Helioseismic and Magnetic Imager on board the Solar Dynamics Observatory observed continuous emergence of small-scale magnetic bipoles with a rate of similar to 10(16) Mx s(-1). The emergence of magnetic fluxes and interactions between different polarities lead to the frequent occurrence of ultraviolet (UV) bursts, which exhibit as intense transient brightenings in the 1400 angstrom images. In the meantime, discrete small patches with the same magnetic polarity tend to move together and merge, leading to the enhancement of the magnetic fields and thus the formation of pores (small sunspots) at some locations. The spectra of these UV bursts are characterized by the superposition of several chromospheric absorption lines on the greatly broadened profiles of some emission lines formed at typical transition region temperatures, suggesting heating of the local materials to a few tens of thousands of kelvin in the lower atmosphere by magnetic reconnection. Some bursts reveal blue-and redshifts of similar to 100 km s(-1) at neighboring pixels, indicating the spatially resolved bidirectional reconnection outflows. Many such bursts appear to be associated with the cancellation of magnetic fluxes with a rate of the order of similar to 10(15) Mx s(-1). We also investigate the three-dimensional magnetic field topology through a magnetohydrostatic model and find that a small fraction of the bursts are associated with bald patches (magnetic dips). Finally, we find that almost all bursts are located in regions of large squashing factor at the height of similar to 1 Mm, reinforcing our conclusion that these bursts are produced through reconnection in the lower atmosphere.

Keywordmagnetic reconnection Sun: chromosphere Sun: transition region Sun: UV radiation sunspots
DOI10.3847/1538-4357/aaaae6
WOS KeywordDYNAMICS-OBSERVATORY SDO ; ELLERMAN BOMBS ; EXPLOSIVE EVENTS ; HIGH-RESOLUTION ; EMERGING FLUX ; CORONAL LOOPS ; REGION ; JETS ; MAGNETOTAIL ; TELESCOPE
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000426158500004
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22275
Collection中国科学院紫金山天文台
Corresponding AuthorTian, Hui
Affiliation1.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China
3.Max Planck Inst Solar Syst Res, Justus von Liebig Weg 3, D-37077 Gottingen, Germany
4.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Tian, Hui,Zhu, Xiaoshuai,Peter, Hardi,et al. Magnetic Reconnection at the Earliest Stage of Solar Flux Emergence[J]. ASTROPHYSICAL JOURNAL,2018,854(2):13.
APA Tian, Hui,Zhu, Xiaoshuai,Peter, Hardi,Zhao, Jie,Samanta, Tanmoy,&Chen, Yajie.(2018).Magnetic Reconnection at the Earliest Stage of Solar Flux Emergence.ASTROPHYSICAL JOURNAL,854(2),13.
MLA Tian, Hui,et al."Magnetic Reconnection at the Earliest Stage of Solar Flux Emergence".ASTROPHYSICAL JOURNAL 854.2(2018):13.
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