Damping of vertical coronal loop kink oscillations through wave tunneling

Details Damping of vertical coronal loop kink oscillations through wave tunneling Damping of vertical coronal loop kink oscillations through wave tunneling

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...438..733b&link_type=abstract

Astronomy and Astrophysics, Volume 438, Issue 2, August I 2005, pp.733-740

Astronomy and Astrophysics

Astrophysics

41

Sun: Corona, Sun: Magnetic Fields, Sun: Oscillations

Scientific paper

The decay rate of vertical kink waves in a curved flux tube is modeled numerically. The full MHD equations are solved for a curved equilibrium flux tube in an arcade geometry and the decay of ψ, the integral over the flux tube of the modulus of the velocity perpendicular to the local magnetic field, is measured. These simulations are 2D and are thus restricted to kink oscillations in the loop plane. The decay rate is found to increase with increasing wavelength, increasing β and decreasing density contrast ratio. The wave tunneling effect is shown to be a possible mechanism for the high decay rate of the recent observed kink oscillation reported by Wang & Solanki (2004).

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