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  Frequently Occurring Reconnection Jets from Sunspot Light Bridges

Tian, H., Yurchyshyn, V., Peter, H., Solanki, S. K., Young, P. R., Ni, L., et al. (2018). Frequently Occurring Reconnection Jets from Sunspot Light Bridges. Astrophysical Journal, 854: 92. doi:10.3847/1538-4357/aaa89d.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-31EE-A Version Permalink: http://hdl.handle.net/21.11116/0000-0004-B076-0
Genre: Journal Article

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 Creators:
Tian, Hui, Author
Yurchyshyn, Vasyl, Author
Peter, Hardi1, Author              
Solanki, Sami K.1, 2, Author              
Young, Peter R., Author
Ni, Lei, Author
Cao, Wenda, Author
Ji, Kaifan, Author
Zhu, Yingjie, Author
Zhang, Jingwen, Author
Samanta, Tanmoy, Author
Song, Yongliang, Author
He, Jiansen, Author
Wang, Linghua, Author
Chen, Yajie, Author
Affiliations:
1Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832289              
2ERC Advanced Grant: Solar magnetic field and its influence on solar variability and activity (SOLMAG), Max Planck Institute for Solar System Research, Max Planck Society, ou_3164813              

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Free keywords: magnetic reconnection; Sun: chromosphere; sunspots; Sun: transition region; Sun: UV radiation
 Abstract: Solid evidence of magnetic reconnection is rarely reported within sunspots, the darkest regions with the strongest magnetic fields and lowest temperatures in the solar atmosphere. Using the world's largest solar telescope, the 1.6 m Goode Solar Telescope, we detect prevalent reconnection through frequently occurring fine-scale jets in the Hα line wings at light bridges, the bright lanes that may divide the dark sunspot core into multiple parts. Many jets have an inverted Y-shape, shown by models to be typical of reconnection in a unipolar field environment. Simultaneous spectral imaging data from the Interface Region Imaging Spectrograph show that the reconnection drives bidirectional flows up to 200 km s−1, and that the weakly ionized plasma is heated by at least an order of magnitude up to ~80,000 K. Such highly dynamic reconnection jets and efficient heating should be properly accounted for in future modeling efforts of sunspots. Our observations also reveal that the surge-like activity previously reported above light bridges in some chromospheric passbands such as the Hα core has two components: the ever-present short surges likely to be related to the upward leakage of magnetoacoustic waves from the photosphere, and the occasionally occurring long and fast surges that are obviously caused by the intermittent reconnection jets.

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Language(s): eng - English
 Dates: 2019-03-192018
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.3847/1538-4357/aaa89d
 Degree: -

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Project name : ERC-2015-AdG - SOLMAG
Grant ID : 695075
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)

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Title: Astrophysical Journal
Source Genre: Journal
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Publ. Info: Chicago, IL : University of Chicago Press for the American Astronomical Society
Pages: - Volume / Issue: 854 Sequence Number: 92 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_2