Waveguide gravity disturbances in vertically inhomogeneous dissipative atmosphere

TL;DR

This paper models trapped atmospheric waves, including IGW and Lamb modes, in a dissipative, vertically inhomogeneous atmosphere using the DSAS method, comparing it with dissipationless models and aligning results with observed ionospheric disturbances.

Contribution

It introduces the application of the dissipative solution above source (DSAS) method to describe waveguide modes in a dissipative atmosphere, accounting for energy leakage and dissipation.

Findings

Modes' spatial and frequency characteristics are consistent across methods.

Results agree with observed traveling ionospheric disturbances.

Dissipative effects are significant in upper atmosphere wave modeling.

Abstract

Trapped atmosphere waves, such as IGW waveguide modes and Lamb modes, are described using dissipative solution above source (DSAS) (Dmitrienko and Rudenko, 2016). Accordingly this description, the modes are disturbances penetrating without limit in the upper atmosphere and dissipating their energy throughout the atmosphere; leakage from a trapping region to the upper atmosphere is taken in consideration. The DSAS results are compared to those based on both accurate and WKB approximated dissipationless equations. It is shown that the spatial and frequency characteristics of modes in the upper atmosphere calculated by any of the methods are close to each other and are in good agreement with the observed characteristics of traveling ionospheric disturbances.