MG12 - Talk detail |
|
Participant |
Cerda-Duran, Pablo | |
|
Institution |
Max-Planck-Institute for Astrophysics - Karl-Schwarzschild-St. 1 - Garching bei Muenchen - - Germany | |
|
Session |
Talk |
Abstract |
|
ANM5 |
Alfven QPOs in Magnetars in the anelastic approximation |
Alfven oscillations of magnetars are a possible explanation for, at least some, of the observed quasi-periodic oscillations (QPOs) in soft gamma repeaters. I present results of two-dimensional simulations of Alfven torsional oscillations in magnetars, modeled as relativistic stars with a dipolar magnetic field. We use a general relativistic magnetohydrodynamics code in the anelastic approximation, which allows for an effective suppression of fluid modes and an accurate description of the Alfven waves. We present also a new method to compute the QPOs frequencies and compare it to the numerical results. |