Characteristics of transverse oscillations in a coronal loop arcade |
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Authors: | E Verwichte V M Nakariakov L Ofman E E Deluca |
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Institution: | 1.Department of Physics,University of Warwick,Coventry,U.K.;2.Catholic University of America/NASA Goddard Space Flight Center, Code 682,Greenbelt,U.S.A.;3.Harvard-Smithsonian Center for Astrophysics,Cambridge,U.S.A. |
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Abstract: | TRACE observations from 15 April 2001 of transverse oscillations in coronal loops of a post-flare loop arcade are investigated. They are considered to be standing fast kink oscillations. Oscillation signatures such as displacement amplitude, period, phase and damping time are deduced from 9 loops as a function of distance along the loop length. Multiple oscillation modes are found with different amplitude profile along the loop length, suggesting the presence of a second harmonic. The damping times are consistent with the hypothesis of phase mixing and resonant absorption, although there is a clear bias towards longer damping times compared with previous studies. The coronal magnetic field strength and coronal shear viscosity in the loop arcade are derived. |
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