Propagation of acoustic waves in a stratified atmosphere, 1

This work is motivated by the chromospheric 3 minute oscillations observed in the K2v bright points. We study acoustic gravity waves in a one-dimensional, gravitationally stratified, isothermal atmosphere. The oscillations are excited either by a velocity pulse imparted to a layer in an atmosphere of infinite vertical extent, or by a piston forming the lower boundary of a semi-infinite medium. We consider both linear and non-linear waves.