Projects per year
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.
Original language | English |
---|---|
Article number | L34 |
Number of pages | 6 |
Journal | Astrophysical Journal Letters |
Volume | 782 |
Issue number | 2 |
DOIs | |
Publication status | Published - 10 Feb 2014 |
Keywords
- Magnetohydrodynamics (MHD) – Sun
- Atmosphere - Sun
- Corona - Sun
- Oscillations-turbulence-waves
Fingerprint
Dive into the research topics of 'Potential Evidence for the Onset of Alfvénic Turbulence in Trans-equatorial Coronal Loops'. Together they form a unique fingerprint.Projects
- 2 Finished
-
Plasma Theory: Solar and Magnetospheric Plasma Theory
Hood, A. W. (PI), Mackay, D. H. (CoI), Neukirch, T. (CoI), Parnell, C. E. (CoI), Priest, E. (CoI), Archontis, V. (Researcher), Cargill, P. (Researcher), De Moortel, I. (Researcher) & Wright, A. N. (Researcher)
Science & Technology Facilities Council
1/04/13 → 31/03/16
Project: Standard
-
Philip Leverhulme Prize: Philip Leverhulme Prize
De Moortel, I. (PI)
1/10/10 → 28/02/15
Project: Standard