Rapid Damping of the Oscillations of Coronal Loops with an Azimuthal Magnetic Field

Details Rapid Damping of the Oscillations of Coronal Loops with an Azimuthal Magnetic Field Rapid Damping of the Oscillations of Coronal Loops with an Azimuthal Magnetic Field

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005astl...31..406m&link_type=abstract

Astronomy Letters, vol. 31, Issue 6, p.406-413

Astronomy and Astrophysics

Astronomy

3

Sun

Scientific paper

We consider the MHD oscillations of an inhomogeneous coronal loop that consists of a dense cord surrounded by a shell. The magnetic field is longitudinal in the cord and has only an azimuthal component in the shell. The parameters of the loop are chosen to be such that there are no resonances; i.e., the resonance points are cut off. This choice is dictated by the formulated problem of considering the influence of the radiation of MHD waves into the surrounding space on the loop oscillations, thereby ruling out the possibility of resonant energy absorption. The wave radiation efficiency is high and allows low oscillation Q-factors, which are equal in order of magnitude to their observed values, to be obtained.

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