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  Signatures of dynamic fibrils at the coronal base: Observations from Solar Orbiter/EUI

Mandal, S., Peter, H., Chitta, L. P., Aznar Cuadrado, R., Schühle, U., Teriaca, L., et al. (2023). Signatures of dynamic fibrils at the coronal base: Observations from Solar Orbiter/EUI. Astronomy and Astrophysics, 670: L3, pp. L3. doi:10.1051/0004-6361/202245431.

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 Creators:
Mandal, Sudip1, Author           
Peter, Hardi1, Author
Chitta, L. P.1, Author           
Aznar Cuadrado, Regina1, Author           
Schühle, Udo1, Author           
Teriaca, Luca1, Author           
Solanki, Sami K.1, Author           
Harra, Louise, Author
Berghmans, David, Author
Auchère, Frédéric, Author
Parenti, Susanna, Author
Zhukov, Andrei N., Author
Buchlin, Éric, Author
Kraaikamp, Emil, Author
Rodriguez, Luciano, Author
Schwanitz, Conrad, Author
Barczynski, Krzysztof, Author
Pelouze, Gabriel, Author
Smith, Philip J., Author
Liu, Wei, Author
Cheung, Mark C., Author more..
Affiliations:
1Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832289              

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Free keywords: Sun: magnetic fields, Sun: UV radiation, Sun: corona, Sun: atmosphere, Astrophysics - Solar and Stellar Astrophysics
 Abstract: The solar chromosphere hosts a wide variety of transients, including dynamic fibrils (DFs) that are characterised as elongated, jet-like features seen in active regions, often through Hα diagnostics. So far, these features have been difficult to identify in coronal images, primarily due to their small size and the lower spatial resolution of the current extreme-ultraviolet (EUV) imagers. Here we present the first unambiguous signatures of DFs in coronal EUV data using high-resolution images from the Extreme Ultraviolet Imager (EUI) on board Solar Orbiter. Using the data acquired with the 174 Å High Resolution Imager (HRIEUV) of EUI, we find many bright dot-like features (with a size of 0.3−0.5 Mm) that move up and down (often repeatedly) in the core of an active region. In a space-time map, these features produce parabolic tracks akin to the chromospheric observations of DFs. Properties such as their speeds (14 km s−1), lifetime (332 s), deceleration (82 m s−2), and lengths (1293 km) are also reminiscent of the chromospheric DFs. The EUI data strongly suggest that these EUV bright dots are basically the hot tips (of the cooler chromospheric DFs) that could not be identified unambiguously before because of a lack of spatial resolution.

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 Dates: 2023-01-272023-02
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1051/0004-6361/202245431
BibTex Citekey: 2023A&A...670L...3M
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Title: Astronomy and Astrophysics
Source Genre: Journal
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Pages: - Volume / Issue: 670 Sequence Number: L3 Start / End Page: L3 Identifier: -