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First direct observation of a torsional Alfvén oscillation at coronal heights

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Kohutova, Petra, Verwichte, E. (Erwin) and Froment, Clara (2020) First direct observation of a torsional Alfvén oscillation at coronal heights. Astronomy and Astrophysics, 633 . L6. doi:10.1051/0004-6361/201937144

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Official URL: http://www.doi.org/10.1051/0004-6361/201937144

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Abstract

Context. Torsional Alfvén waves are promising candidates for the transport of energy across different layers of the solar atmosphere. They have been predicted theoretically for decades. Previous detections of Alfvén waves so far have however mostly relied on indirect signatures.

Aims. We present the first direct observational evidence of a fully resolved torsional Alfvén oscillation of a large-scale structure occurring at coronal heights.

Methods. We analysed IRIS imaging and spectral observation of a surge resulting from magnetic reconnection between active region prominence threads and surrounding magnetic field lines.

Results. The IRIS spectral data provide clear evidence of an oscillation in the line-of-sight velocity with a 180° phase difference between the oscillation signatures at opposite edges of the surge flux tube. This together with an alternating tilt in the Si IV and Mg II k spectra across the flux tube and the trajectories traced by the individual threads of the surge material provide clear evidence of torsional oscillation of the flux tube.

Conclusions. Our observation shows that magnetic reconnection leads to the generation of large-scale torsional Alfvén waves.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Sun -- Corona, Magnetohydrodynamics, Cosmic magnetic fields, Solar oscillations -- Research
Journal or Publication Title: Astronomy and Astrophysics
Publisher: EDP Science
Official Date: 13 January 2020
Dates:
DateEvent
13 January 2020Published
7 December 2019Accepted
Date of first compliant deposit: 3 February 2020
Volume: 633
Article Number: L6
DOI: 10.1051/0004-6361/201937144
Status: Peer Reviewed
Publication Status: Published
Publisher Statement: Reproduced with permission from Astronomy & Astrophysics, © ESO
Access rights to Published version: Restricted or Subscription Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
ST/L000733/I[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
UNSPECIFIEDCentre National d’Etudes SpatialesUNSPECIFIED
262622Norges ForskningsrådUNSPECIFIED

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