High-resolution Spectroscopic Imaging of Counter-streaming Motions in Solar Active Region Magnetic Loops
Yang,Xu1; Cao,Wenda1,2; Ji,Haisheng3,4; Hashim,Parida5,6; Shen,Jinhua5
Source PublicationThe Astrophysical Journal Letters
AbstractAbstract We carried out high-resolution spectroscopic imaging in He i 10830 ? and Hα for a set of active region (NOAA 12569) magnetic loops of different sizes (classified into short and long loops) with the Goode Solar Telescope at the Big Bear Solar Observatory on 2016 July 18. The long loops take the form of an chromospheric arch filament system, yet their extreme ultraviolet (EUV) counterparts are observed by the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory. Animations of blue- and red-wing images give counter-streaming motions; i.e., chromospheric absorption features in blue- and red-wing images move in opposite directions at different strands. The moving pattern is detected with the local correlation tracking method and confirmed by Doppler shifts. We speculate that, combined with the results of wavelet analysis that gives obvious 4 minute oscillation along trailing polarity, counter-streaming motions for short loops could be powered by p-mode leakage. However, for counter-streaming motions in long loops, we show that unidirectional mass flows in two opposite directions are accompanied with simultaneous weak EUV brightenings. Heating processes, probably by magnetic reconnection at footpoints, may have occurred. In addition, plasma flows along the magnetic loops, tracked with absorption features in He i 10830 ?, are found to be ejected from and drained out into inter-granule lane areas at different ends of the loop system.
KeywordSun: chromosphere Sun: corona Sun: granulation Sun: photosphere
WOS IDIOP:2041-8205-881-1-ab365b
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.Center for Solar-Terrestrial Research, New Jersey Institute of Technology, 323 Martin Luther King Boulevard, Newark, NJ 07102, USA;
2.Big Bear Solar Observatory, New Jersey Institute of Technology, Big Bear City, CA 92314, USA
3.Key Laboratory for Dark Matter and Space Science, Purple Mountain Observatory, CAS, Nanjing, 210008, People’s Republic of China
4.China Three Gorges University, Yichang, 443002, People’s Republic of China
5.Xinjiang Astronomical Observatory, CAS, Urumqi, 830011, People’s Republic of China
6.University of Chinese Academy of Sciences, Beijing, 100049, People’s Republic of China
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GB/T 7714
Yang,Xu,Cao,Wenda,Ji,Haisheng,et al. High-resolution Spectroscopic Imaging of Counter-streaming Motions in Solar Active Region Magnetic Loops[J]. The Astrophysical Journal Letters,2019,881(1).
APA Yang,Xu,Cao,Wenda,Ji,Haisheng,Hashim,Parida,&Shen,Jinhua.(2019).High-resolution Spectroscopic Imaging of Counter-streaming Motions in Solar Active Region Magnetic Loops.The Astrophysical Journal Letters,881(1).
MLA Yang,Xu,et al."High-resolution Spectroscopic Imaging of Counter-streaming Motions in Solar Active Region Magnetic Loops".The Astrophysical Journal Letters 881.1(2019).
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