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

DIPANKAR BANERJEE

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.