The Influence of a Magnetic field on Radiative Damping of magnetoatmospheric oscillations


Indian Institute of Astrophysics,Bangalore 560034, India.

Armagh Observatory, Armagh, BT61 9DG,N.Ireland

S. S. Hasan

Indian Institute of Astrophysics,Bangalore 560034, India.

J. Christensen-Dalsgaard

Teoretisk Astrofysik Center, Danmarks Grundforskningsfond, and Institut for Fysik og Astronomi, Aarhus Universitet, DK-8000 Aarhus C, Denmark

Abstract: We investigate the influence of a magnetic field on the radiative damping of magnetoatmospheric waves, extending our previous work on the adiabatic modes of an isothermal stratified atmosphere with a uniform vertical magnetic field. Banerjee, Hasan & Christensen-Dalsgaard (1996, 1997) generalized this work to include radiative effects using Newton's law of cooling for a weak magnetic field. The present study examines the variation of the mode damping rate with increasing magnetic field strength. We find that a moderate field suppresses radiative damping.