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

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Mandal,  Sudip
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

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Peter,  Hardi
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

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Chitta,  L. P.
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

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Aznar Cuadrado,  Regina
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

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Schühle,  Udo
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

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Teriaca,  Luca
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

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Solanki,  Sami K.
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

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Citation

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.


Cite as: https://hdl.handle.net/21.11116/0000-000C-AB84-E
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.