The Library
Acoustic response to transverse oscillations in a solar coronal loop
Tools
White, S. J. and Verwichte, E. (Erwin) (2021) Acoustic response to transverse oscillations in a solar coronal loop. Astronomy & Astrophysics, 654 . A33. doi:10.1051/0004-6361/202141515 ISSN 0004-6361.
|
PDF
WRAP-acoustic-response-transverse-oscillations-loop-Verwichte-2021.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (2851Kb) | Preview |
|
PDF
WRAP-acoustic-response-transverse-oscillations-loop-Verwichte-2021.pdf - Accepted Version Embargoed item. Restricted access to Repository staff only - Requires a PDF viewer. Download (4Mb) |
Official URL: https://doi.org/10.1051/0004-6361/202141515
Abstract
Context. Magnetohydrodynamic (MHD) waves play an important role in the dynamics and heating of the solar corona. Their investigation also reveals information about the local conditions. Transverse (Alfvénic) oscillations of loops commonly occur in response to solar eruptions. It has been shown that these oscillations elicit an acoustic response through wave coupling at the footpoint and the pondermotive force.
Aims. We extend the modelling of wave coupling between a transverse loop oscillation and slow magnetoacoustic waves through line-tied footpoint boundary conditions by considering the effect of transverse loop structuring and non-linearity.
Methods. We combine analytical wave modelling with fully non-linear MHD simulations to study the wave field of propagating slow waves in a two-dimensional slab loop (arcade) model.
Results. We demonstrate that transverse loop oscillations generate propagating slow waves from the footpoints with the same periodicity but shorter wavelength determined by the local sound speed. The degree of wave coupling is proportional to the square root of the plasma-β. The slow wave field is anti-symmetric in the direction of transverse wave polarisation. We show through synthetic diagnostics that this has important consequences for their observability in terms of the orientation of the loop with respect to the observer. We also show that for the interpretation of intensity oscillations associated with typical loop oscillations the ponderomotive response also needs to be taken into account. The modelling presented here allows for the successful identification of the slow waves and pondermotive response in a previous observational study.
Item Type: | Journal Article | ||||||
---|---|---|---|---|---|---|---|
Subjects: | Q Science > QB Astronomy | ||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
Library of Congress Subject Headings (LCSH): | Sun, Magnetohydrodynamics, Shock waves, Solar magnetic fields, Solar activity, Astrophysics | ||||||
Journal or Publication Title: | Astronomy & Astrophysics | ||||||
Publisher: | EDP Sciences | ||||||
ISSN: | 0004-6361 | ||||||
Official Date: | 7 October 2021 | ||||||
Dates: |
|
||||||
Volume: | 654 | ||||||
Article Number: | A33 | ||||||
DOI: | 10.1051/0004-6361/202141515 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Reuse Statement (publisher, data, author rights): | Reproduced with permission from Astronomy & Astrophysics, © ESO. | ||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||
Date of first compliant deposit: | 19 July 2021 | ||||||
Date of first compliant Open Access: | 20 July 2021 | ||||||
RIOXX Funder/Project Grant: |
|
||||||
Related URLs: |
Request changes or add full text files to a record
Repository staff actions (login required)
View Item |
Downloads
Downloads per month over past year