The effect of density stratification on the resonant absorption of MHD waves in coronal loops |
| |
Authors: | K Karami S Nasiri S Amiri |
| |
Institution: | Department of Physics, University of Kurdistan, Pasdaran St, PO Box 66177-15175, Sanandaj, Iran;Research Institute for Astronomy and Astrophysics of Maragha (RIAAM), PO Box 55134-441, Maragha, Iran;Institute for Advanced Studies in Basic Sciences (IASBS), Gava Zang, PO Box 45195-1159, Zanjan, Iran;Department of Physics, Zanjan University, Zanjan, Iran |
| |
Abstract: | The standing quasi-modes of the ideal magnetohydrodynamics (MHD) in a zero-β cylindrical magnetic flux tube that undergoes a longitudinal density stratification and radial density structuring are considered. The radial structuring is assumed to be a linearly varying density profile. Using the relevant connection formulae of the resonant absorption, the dispersion relation for the fast MHD body waves is derived and solved numerically to obtain both the frequencies and damping rates of the fundamental and first-overtone, k = 1, 2 , modes of both the kink ( m = 1) and fluting ( m = 2) waves, where k and m are the longitudinal and azimuthal mode numbers, respectively. |
| |
Keywords: | Sun: corona Sun: magnetic fields Sun: oscillations |
|
|