The effect of curvature on quasi-modes in coronal loops

Details The effect of curvature on quasi-modes in coronal loops The effect of curvature on quasi-modes in coronal loops

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004a%26a...424.1065v&link_type=abstract

Astronomy and Astrophysics, v.424, p.1065-1074 (2004)

Astronomy and Astrophysics

Astrophysics

76

Magnetohydrodynamics (Mhd), Plasmas, Sun: Corona, Sun: Oscillations

Scientific paper

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-β=0. 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.
Appendix A is only available in electronic form at http://www.edpsciences.org

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