Solar Physics

, Volume 280, Issue 1, pp 153–163 | Cite as

Fast Sausage Waves in Current-Carrying Coronal Loops

  • O. V. Khongorova
  • B. B. Mikhalyaev
  • M. S. Ruderman
Article

Abstract

Fast sausage waves in a model coronal loop that consists of a cylindrical core with axial magnetic field and coaxial annulus with purely azimuthal magnetic field are considered. It is shown that the principal mode of fast sausage waves with arbitrary wavelength, which is the mode having no nodes in the radial direction, can be supported by such a loop. All other modes can propagate in such a loop as trapped modes only if their wavelengths are smaller than the cut-off wavelength. The obtained theoretical results are applied to the interpretation of observed periodic pulsations of microwave emission in flaring loops with periods of a few tens of seconds.

Keywords

Coronal seismology Magnetic fields Oscillations 

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • O. V. Khongorova
    • 1
  • B. B. Mikhalyaev
    • 1
  • M. S. Ruderman
    • 2
  1. 1.Department of Theoretical PhysicsKalmyk State UniversityElistaRussia
  2. 2.Solar Physics and Space Plasma Research Centre (SP2RC), School of Mathematics and StatisticsUniversity of SheffieldSheffieldUK

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