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Unveiling the magnetic nature of chromospheric vortices
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Murabito, Mariarita, Shetye, Juie, Stangalini, Marco, Verwichte, E. (Erwin), Arber, T. D., Ermolli, Ilaria, Giorgi, Fabrizio and Goffrey, Tom (2020) Unveiling the magnetic nature of chromospheric vortices. Astronomy and Astrophysics, 639 . A59. doi:10.1051/0004-6361/202038360 ISSN 0004-6361.
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WRAP-Unveiling-magnetic-nature-chromospheric-vortices-2020.pdf - Accepted Version - Requires a PDF viewer. Download (1697Kb) | Preview |
Official URL: https://doi.org/10.1051/0004-6361/202038360
Abstract
Context. Vortex structures in the Sun’s chromosphere are believed to channel energy between different layers of the solar atmosphere.
Aims. We investigate the nature and dynamics of two small-scale quiet-Sun rotating structures in the chromosphere.
Methods. We analysed two chromospheric structures that show clear rotational patterns in spectropolarimetric observations taken with the Interferometric Bidimensional Spectrometer at the Ca II 8542 Å line.
Results. We present the detection of spectropolarimetric signals that manifest the magnetic nature of rotating structures in the chromosphere. Our observations show two long-lived structures of plasma that each rotate clockwise inside a 10 arcsec2 quiet-Sun region. Their circular polarisation signals are five to ten times above the noise level. Line-of-sight Doppler velocity and horizontal velocity maps from the observations reveal clear plasma flows at and around the two structures. A magnetohydrodynamics simulation shows these two structures are plausibly magnetically connected. Wave analysis suggests that the observed rotational vortex pattern could be due to a combination of slow actual rotation and a faster azimuthal phase speed pattern of a magnetoacoustic mode.
Conclusions. Our results imply that the vortex structures observed in the Sun’s chromosphere are magnetic in nature and that they can be connected locally through the chromosphere
Item Type: | Journal Article | |||||||||
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Subjects: | Q Science > QB Astronomy | |||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||
Library of Congress Subject Headings (LCSH): | Solar chromosphere , Solar atmosphere, Vortex theory (Astrophysics) , Solar magnetic fields, Sun -- Corona -- Magnetic fields | |||||||||
Journal or Publication Title: | Astronomy and Astrophysics | |||||||||
Publisher: | EDP Sciences | |||||||||
ISSN: | 0004-6361 | |||||||||
Official Date: | 7 July 2020 | |||||||||
Dates: |
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Volume: | 639 | |||||||||
Article Number: | A59 | |||||||||
DOI: | 10.1051/0004-6361/202038360 | |||||||||
Status: | Peer Reviewed | |||||||||
Publication Status: | Published | |||||||||
Reuse Statement (publisher, data, author rights): | “Reproduced with permission from Astronomy & Astrophysics, © ESO”. | |||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||
Copyright Holders: | © ESO | |||||||||
Date of first compliant deposit: | 2 July 2020 | |||||||||
Date of first compliant Open Access: | 2 July 2020 | |||||||||
RIOXX Funder/Project Grant: |
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