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  Solar ultraviolet bursts in a coordinated observation of IRIS, Hinode and SDO

Chen, Y., Tian, H., Zhu, X. S., Samanta, T., Wang, L., & He, J. (2019). Solar ultraviolet bursts in a coordinated observation of IRIS, Hinode and SDO. Science China Technological Science, 62(9), 1555-1564. doi:10.1007/s11431-018-9471-6.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-EF57-D Version Permalink: https://hdl.handle.net/21.11116/0000-0005-EF58-C
Genre: Journal Article

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 Creators:
Chen, YaJie, Author
Tian, Hui, Author
Zhu, Xiao Shuai1, Author
Samanta, Tanmoy, Author
Wang, LingHua, Author
He, JianSen, Author
Affiliations:
1Max Planck Institute for Solar System Research, Max Planck Society, Justus-von-Liebig-Weg 3, 37077 Göttingen, DE, ou_1125546              

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 Abstract: Solar ultraviolet (UV) bursts are small-scale compact brightenings in transition region images. The spectral profiles of transition region lines in these bursts are significantly enhanced and broadened, often with chromospheric absorption lines such as Ni ii 1335.203 and 1393.330 Å superimposed. We investigate the properties of several UV bursts using a coordinated observation of the Interface Region Imaging Spectrograph (IRIS), Solar Dynamics Observatory (SDO), and Hinode on February 7, 2015. We have identified 12 UV bursts, and 11 of them reveal small blueshifts of the Ni ii absorption lines. However, the Ni ii lines in one UV burst exhibit obvious redshifts of ~20 km s−1, which appear to be related to the cold plasma downflows observed in the IRIS slit-jaw images. We also examine the three-dimensional magnetic field topology using a magnetohydrostatic model, and find that some UV bursts are associated with magnetic null points or bald patches. In addition, we find that these UV bursts reveal no obvious coronal signatures from the observations of the Atmospheric Imaging Assembly (AIA) on board SDO and the EUV Imaging Spectrometer (EIS) on board Hinode.

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Language(s): eng - English
 Dates: 2019
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1007/s11431-018-9471-6
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Title: Science China Technological Science
Source Genre: Journal
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Pages: - Volume / Issue: 62 (9) Sequence Number: - Start / End Page: 1555 - 1564 Identifier: -