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Potential Evidence for the Onset of Alfvénic Turbulence in Trans-equatorial Coronal Loops

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moortel2014astrophysjlettl34.pdf (740.8Kb)
Date
10/02/2014
Author
De Moortel, Ineke
McIntosh, Scott
Threlfall, James William
Bethge, Christian
Liu, J
Funder
Science & Technology Facilities Council
The Leverhulme Trust
Grant ID
ST/K000950/1
Keywords
Magnetohydrodynamics (MHD) – Sun
Atmosphere - Sun
Corona - Sun
Oscillations-turbulence-waves
QC Physics
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Abstract
This study investigates Coronal Multi-channel Polarimeter Doppler-shift observations of a large, off-limb, trans-equatorial loop system observed on 2012 April 10-11. Doppler-shift oscillations with a broad range of frequencies are found to propagate along the loop with a speed of about 500 km s–1. The power spectrum of perturbations travelling up from both loop footpoints is remarkably symmetric, probably due to the almost perfect north-south alignment of the loop system. Compared to the power spectrum at the footpoints of the loop, the Fourier power at the apex appears to be higher in the high-frequency part of the spectrum than expected from theoretical models. We suggest this excess high-frequency power could be tentative evidence for the onset of a cascade of the low-to-mid frequency waves into (Alfvénic) turbulence.
Citation
De Moortel , I , McIntosh , S , Threlfall , J W , Bethge , C & Liu , J 2014 , ' Potential Evidence for the Onset of Alfvénic Turbulence in Trans-equatorial Coronal Loops ' , Astrophysical Journal Letters , vol. 782 , no. 2 , L34 . https://doi.org/10.1088/2041-8205/782/2/L34
Publication
Astrophysical Journal Letters
Status
Peer reviewed
DOI
https://doi.org/10.1088/2041-8205/782/2/L34
ISSN
2041-8205
Type
Journal article
Rights
© 2014. The American Astronomical Society. All rights reserved
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/4740

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