LINEAR OSCILLATIONS IN A VISCOUS HEAT-CON DUCTING ISOTHERMAL ATMOSPHERE .1.

A theoretical study is made of linear acoustic and internal gravity wa ves (AGW) in an isothermal atmosphere with an exponential distribution of equilibrium density and pressure. The model of the atmosphere unde r consideration includes viscosity and heat conduction whose kinematic values grow exponentially with height. Two cases are analyzed: a heat conducting atmosphere without viscosity and an atmosphere with viscos ity small in respect to heat conductivity. In the first case an accura te solution is obtained which describes the whole class of monochromat ic oscillations for layered model satisfying the boundary conditions. An analytical expression is found for the AGW reflection coefficient f rom a region with large heat conduction. In the second case a similar problem is solved approximately.