Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012a%26a...539a..37p&link_type=abstract
Astronomy & Astrophysics, Volume 539, id.A37
Astronomy and Astrophysics
Astrophysics
Sun: Corona, Magnetohydrodynamics (Mhd), Sun: Atmosphere, Sun: Magnetic Topology, Waves
Scientific paper
Aims: We investigate the damping process for propagating transverse velocity oscillations, observed to be ubiquitous in the solar corona, due to mode coupling. Methods: We perform 3D numerical simulations of footpoint-driven transverse waves propagating in a low β coronal plasma with a cylindrical density structure. Mode coupling in an inhomogeneous layer leads to the coupling of the kink mode to the Alfvén mode, observed as the decay of the transverse kink oscillations. Results: We consider the spatial damping profile and find a Gaussian damping profile of the form exp(-z2/Lg2) to be the most congruent with our numerical data, rather than the exponential damping profile of the form exp(- z/Ld) used in normal mode analysis. Our results highlight that the nature of the driver itself will have a substantial influence on observed propagating kink waves. Conclusions: Our study suggests that this modified damping profile should be taken into account when using coronal seismology to infer local plasma properties from observed damped oscillations.
de Moortel Ineke
Hood Alan William
Pascoe David J.
Wright Andrew. N.
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