| Issue |
A&A
Volume 424, Number 3, September IV 2004
|
|
|---|---|---|
| Page(s) | 1065 - 1074 | |
| Section | The Sun | |
| DOI | https://doi.org/10.1051/0004-6361:20041239 | |
| Published online | 06 September 2004 | |
The effect of curvature on quasi-modes in coronal loops*
Centre for Plasma Astrophysics, KU Leuven, Belgium e-mail: tomvd@wis.kuleuven.ac.be
Received:
6
May
2004
Accepted:
3
June
2004
This paper studies quasi-mode oscillations in models of coronal loops that include longitudinal curvature.
Using a toroidal coordinate system to incorporate curvature in a basic coronal loop model, the linearized ideal MHD equations are solved for the plasma-
. As a result of the curvature, quasi-modes with different poloidal wave numbers are coupled resulting in modifications of the frequencies. However, for small curvature, only the coupling of quasi-modes with a neighbouring poloidal wave number remains in first order. In addition, the quasi-mode frequencies are unchanged up to first order in the curvature. The imaginary part of the frequency, however, does change in first order, and quasi-modes are slightly more damped in realistically curved coronal loop configurations.
Key words: magnetohydrodynamics (MHD) / plasmas / Sun: corona / Sun: oscillations
© ESO, 2004
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.