New Damping Mechanism for Coronal Loop Kink Oscillation

Details New Damping Mechanism for Coronal Loop Kink Oscillation New Damping Mechanism for Coronal Loop Kink Oscillation

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.547..465z&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

1

Solar Corona, Mhd Waves, Wave Damping

Scientific paper

We propose a new damping mechanism for the coronal loop kink oscillation. We show that the periodic shearing motion near the xed footpoints of the coronal loop, oscillating in the global kink mode, is unstable and leads to the resonant generation of slow magnetosonic waves when the system tries to smooth out the spatial inhomogeneity of the motion. Therefore, the kink oscillation transfers its energy into many harmonics of slow magnetosonic waves propagating with di erent angles about the loop axis and consequently it can be quickly damped, as observed by TRACE. The mechanism can be tested by the observation of slow magnetosonic waves at the loop footpoints during and/or after the damping of kink oscillations.

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