Transverse oscillations of a multi-stranded loop

Abstract

We investigate the transverse oscillations of a line-tied multi-stranded coronal loop composed of several parallel cylindrical strands. First, the collective fast normal modes of the loop are found with the T-matrix theory. There is a huge quantity of normal modes with very different frequencies and a complex structure of the associated magnetic pressure perturbation and velocity field. The modes can be classified as bottom, middle, and top according to their frequencies and spatial structure. Second, the temporal evolution of the velocity and magnetic pressure perturbation after an initial disturbance are analyzed. We find complex motions of the strands. The frequency analysis reveals that these motions are a combination of low and high frequency modes. The complexity of the strand motions produces a strong modulation of the whole tube movement. We conclude that the presumed internal fine structure of a loop influences its transverse oscillations and so its transverse dynamics cannot be properly described by those of an equivalent monolithic loop.

Accepted in ApJ

References in corpus (8)

• On Solving the Coronal Heating Problem
• Determination of the Coronal Magnetic Field by Hot Loop Oscillations
• Resonant absorption in complicated plasma configurations: applications to multi-stranded coronal loop oscillations
• Transverse oscillations of two coronal loops
• Transverse oscillations of systems of coronal loops
• Linear high-resolution schemes for hyperbolic conservation laws: TVB numerical evidence
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