Damping of Coronal Loop Oscillations

Details Damping of Coronal Loop Oscillations Damping of Coronal Loop Oscillations

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.547..453v&link_type=abstract

Proceedings of 'SOHO 13 - Waves, Oscillations and Small-Scale Transient Events in the Solar Atmosphere: A Joint View from SOHO a

Computer Science

Sun: Corona, Coronal Heating, Coronal Loops, Oscillations

Scientific paper

The analytic study of coronal loop oscillations in equilibrium states with thin nonuniform boundary layers is extended by a numerical investigation for 1D nonuniform equilibrium states. The frequency and the damping time of the ideal kink quasi-mode are calculated in fully resistive MHD. In this numerical investigation there is no need to adopt the assumption of a thin nonuniform boundary layer which is essential for analytic theory. The dependence of the complex frequency of the kink mode on the width of the nonuniform layer, the length of the loop and the density contrast between the internal and the external region is studied and is compared with analytical theory which is only valid for thin boundaries. When the width of the nonuniformlayer is varied, the differences between our numerical results and the results obtained with analytical formula, still amount up to 25%.

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