IONOSPHERIC DISTURBANCES AND THEIR EFFECTS ON THE PROPAGATION OF HF ELECTROMAGNETIC WAVES.
Final rept. for Jun 60-Jun 64,
MICHIGAN UNIV ANN ARBOR RADIATION LAB
Pagination or Media Count:
This report is concerned with the effect of ionospheric disturbances on HF radio waves whose propagation path is at a large distance from the source of the disturbance. The perturbation of the HF radio waves is assumed to be due to mechanical waves propagating in the atmosphere. The macroscopic equations governing the propagation of mechanical waves in the atmosphere, including the effects of viscosity and thermal conductivity, are developed. A simple model of the atmosphere is proposed and a technique, suitable for numerical analysis, is developed for determining the various modes propagating. The effect of the earths magnetic field on the propagation of mechanical waves is evaluated and it is concluded that this effect is small. The modification of the disturbance due to the presence of charged particles is discussed in conjunction with a comparison of the microscopic and macroscopic formulation of the equations of motion. An idealized description of the source is given in the appendix and some solutions to some simple problems are discussed. Author