Title: Damping of filament thread oscillations: effect of the slow continuum
Authors: Soler, R
Oliver, R
Ballester, JL
Goossens, Marcel # ×
Issue Date: 2009
Publisher: University of Chicago Press for the American Astronomical Society
Series Title: Astrophysical journal vol:695 issue:2 pages:L166-L170
Abstract: Transverse oscillations of small amplitude are commonly seen in high-resolution observations of filament threads,
i.e., the fine structures of solar filaments/prominences, and are typically damped in a few periods. Kink wave modes
supported by the thread body offer a consistent explanation of these observed oscillations. Among the proposed
mechanisms to explain the kink mode damping, resonant absorption in the Alfvén continuum seems to be the
most efficient as it produces damping times of about three periods. However, for a nonzero-β plasma and typical
prominence conditions, the kink mode is also resonantly coupled to slow (or cusp) continuum modes, which could
further reduce the damping time. In this Letter, we explore for the first time both analytically and numerically the
effect of the slow continuum on the damping of transverse thread oscillations. The thread model is composed of a
homogeneous and straight cylindrical plasma, an inhomogeneous transitional layer, and the homogeneous coronal plasma. We find that the damping of the kink mode due to the slow resonance is much less efficient than that due to the Alfvén resonance.
ISSN: 0004-637X
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Plasma-astrophysics Section
× corresponding author
# (joint) last author

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