Damped transverse oscillations of interacting coronal loops

Abstract

Damped transverse oscillations of magnetic loops are routinely observed in the solar corona. This phenomenon is interpreted as standing kink magnetohydrodynamic waves, which are damped by resonant absorption owing to plasma inhomogeneity across the magnetic field. The periods and damping times of these oscillations can be used to probe the physical conditions of the coronal medium. Some observations suggest that interaction between neighboring oscillating loops in an active region may be important and can modify the properties of the oscillations compared to those of an isolated loop. Here we theoretically investigate resonantly damped transverse oscillations of interacting non-uniform coronal loops. We provide a semi-analytic method, based on the T-matrix theory of scattering, to compute the frequencies and damping rates of collective oscillations of an arbitrary configuration of parallel cylindrical loops. The effect of resonant damping is included in the T-matrix scheme in the thin boundary approximation. Analytic and numerical results in the specific case of two interacting loops are given as an application.

Accepted for publication in A&A

References in corpus (4)

• Resonant absorption in complicated plasma configurations: applications to multi-stranded coronal loop oscillations
• Magnetohydrodynamic kink waves in nonuniform solar flux tubes: phase mixing and energy cascade to small scales
• Transverse oscillations of two coronal loops
• The resonant damping of fast magnetohydrodynamic oscillations in a system of two coronal slabs

Cited by in corpus (5)

• Kink oscillations of coronal loops
• The instability and non-existence of multi-stranded loops, when driven by transverse waves
• Oblique Quasi-Kink Modes in Solar Coronal Slabs Embedded in an Asymmetric Magnetic Environment: Resonant Damping, Phase and Group Diagrams
• Fundamental Transverse Vibrations of the Active Region Solar Corona
• Modeling the effects of a lightbridge on oscillations in a solar pore