Damped oscillations of two interacting coronal loops

Details Damped oscillations of two interacting coronal loops Damped oscillations of two interacting coronal loops

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008iaus..247..133a&link_type=abstract

Waves & Oscillations in the Solar Atmosphere: Heating and Magneto-Seismology, Proceedings of the International Astronomical Unio

Astronomy and Astrophysics

Astronomy

Mhd, Sun: Corona, Sun: Magnetic Fields, Waves

Scientific paper

We present results on the oscillatory properties (periods, damping rates, and spatial distribution of perturbations) for resonantly damped oscillations in a system of two inhomogeneous coronal slabs and compare them to the properties found in single slab loop models. A system of two identical coronal loops is modelled, in Cartesian geometry, as being composed by two density enhancements. The linear magnetohydrodynamic (MHD) wave equations for oblique propagation of waves are solved and the damping due to resonant absorption is computed. Due to the interaction between the loops, the normal modes of oscillation present in a single slab split into symmetric and antisymmetric oscillations when a system of two identical slabs is considered. The frequencies of these solutions may differ from the single slab results when the distance between the loops is of the order of a few slab widths. Oblique propagation of waves weakens this interaction, since solutions become more confined to the edges of the slabs. The damping is strong for surface-like oscillations, while sausage body-like solutions are unaffected.

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