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

Mandal, S; Peter, H; Chitta, LP; Cuadrado, RA; Schühle, U; Teriaca, L; Solanki, SK; ... Cheung, MC; + view all (2023) Signatures of dynamic fibrils at the coronal base: Observations from Solar Orbiter/EUI. Astronomy & Astrophysics , 670 , Article L3. 10.1051/0004-6361/202245431. Green open access

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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.

Type: Article
Title: Signatures of dynamic fibrils at the coronal base: Observations from Solar Orbiter/EUI
Open access status: An open access version is available from UCL Discovery
DOI: 10.1051/0004-6361/202245431
Publisher version: https://doi.org/10.1051/0004-6361/202245431
Language: English
Additional information: © The Authors 2023 Licence Creative CommonsOpen Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. This article is published in open access under the Subscribe-to-Open model. Open Access funding provided by Max Planck Society.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/10164628
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