However, studies of thermally sensitive molecular absorptions in the infrared revealed puzzling anomalies. Finally, I will examine the potential of the pseudo-modes to provide a tomography of the solar chromosphere. We examine the non adiabatic effects on the modes of an isothermal stratified magnetic atmosphere. Including Newtonian Cooling, in the weak field limit, an analytic expression for the dispersion relation is derived which allows the effect of weak magnetic field on the modes to be studied. We study the full frequency spectrum and the interaction amongst various modes.
Strong mode coupling in the avoided crossing regions permits energy leakage.
Our results, find application in the analysis of waves in flux-tubes on the Sun. We study the influence of magnetoatmospheric waves on spectral line profiles. On the other hand, we are confronted with puzzling difficulties, even under quiet solar surface conditions, in matching the observational results with detailed predictions from 1-D simulations. However, the observations provide 3-D information on the amplitude, phase, wave form etc. They help to clearly distinguish e.g. running from standing waves, to detect reflected and scattered waves, and to separate local events from global oscillations.