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Magnetic Reconnection at the Earliest Stage of Solar Flux Emergence
Tian, Hui; Zhu, Xiaoshuai; Peter, Hardi; Zhao, Jie; Samanta, Tanmoy; Chen, Yajie
2018
发表期刊ASTROPHYSICAL JOURNAL
卷号854期号:2页码:174
摘要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.
语种英语
WOS记录号WOS:000426158500004
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文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/17969
专题暗物质和空间天文实验室
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Tian, Hui,Zhu, Xiaoshuai,Peter, Hardi,et al. Magnetic Reconnection at the Earliest Stage of Solar Flux Emergence[J]. ASTROPHYSICAL JOURNAL,2018,854(2):174.
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),174.
MLA Tian, Hui,et al."Magnetic Reconnection at the Earliest Stage of Solar Flux Emergence".ASTROPHYSICAL JOURNAL 854.2(2018):174.
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