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Characteristics of transverse oscillations in a coronal loop arcade

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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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Authors and Affiliations

  1. Department of Physics, University of Warwick, CV4 7AL, Coventry, U.K.

    E. Verwichte & V. M. Nakariakov

  2. Catholic University of America/NASA Goddard Space Flight Center, Code 682, 20771, Greenbelt, MD, U.S.A.

    L. Ofman

  3. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, 02138, Cambridge, MA, U.S.A.

    E. E. Deluca

Authors
  1. E. Verwichte
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  2. V. M. Nakariakov
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  3. L. Ofman
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  4. E. E. Deluca
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Verwichte, E., Nakariakov, V.M., Ofman, L. et al. Characteristics of transverse oscillations in a coronal loop arcade. Sol Phys 223, 77–94 (2004). https://doi.org/10.1007/s11207-004-0807-6

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  • DOI: https://doi.org/10.1007/s11207-004-0807-6

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