Abstract:
We examine the influence of radiative damping on the modes of an
isothermal magnetized plasma. This investigation is an extension of
earlier work by Hasan & Christensen-Dalsgaard (1992) and Banerjee, Hasan &
Christensen-Dalsgaard (1995, 1996), which treated the effects of a uniform
vertical magnetic field on the adiabatic modes of a stratified atmosphere.
We focus on the properties of the Lamb mode and examine its interaction
with a magnetic mode. We show that radiative dissipation can significantly
alter the Lamb-mode frequency and lead to a enhanced damping of the waves
at the avoided crossings in the k - w diagram. This mechanism could be
important for wave damping in flux tubes on the Sun.
