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“School of Physic”

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Paper   IPM / Physic / 7829
School of Physics
  Title:   Resonant Absorption in Dissipative Flux Tubes
  Author(s): 
1.  H. Safari
2.  S. Nasiri
3.  K. Karami
4.  Y. Sobouti
  Status:   Published
  Journal: Astronomy & Astrophysics
  Vol.:  448
  Year:  2006
  Pages:   375-378
  Supported by:  IPM
  Abstract:
Oscillations of coronal loops are believed to be the primary cause of the solar corona heating. We study the resonant absorbtion of MHD waves in magnetized flux tubes with graded densities across the cross section of the tube. Within the approximation that resistive and viscous processes are operative in thin layers surrounding the singularities of the MHD equations, we give the full spectrum of the eigenfrequencies, damping rates, as well as, the eigenfields of the normal MHD modes of the tube. Both surface and body modes are analyzed and the contribution of each class to heating of the corona is commented on.

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