HF propagation through actively modified ionospheres
Abstract
A computer modeling capability was developed to predict the effect of localized electron density perturbations created by chemical releases or high power radio frequency heating upon oblique, onehop hf propagation paths. Three dimensional deterministic descriptions of the depleted or enhanced ionization, including formation, evolution, and drift are included. A homing ray trace code was developed to calculate the path of energy propagation through the modified ionosphere in order to predict multipath effects. Also considered is the effect of random index of refraction variations using a formalism to calculate the mutual coherence functions for spatial and frequency separations based upon a path integral solution of the parabolic wave equation for a single refracted path through an ionosphere which contains random electron density fluctuations.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 1990
 Bibcode:
 1990STIN...9022705A
 Keywords:

 Computerized Simulation;
 Electron Density (Concentration);
 Ionospheric Propagation;
 Mathematical Models;
 Radio Frequencies;
 Earth Ionosphere;
 Hamiltonian Functions;
 Plasma Density;
 Communications and Radar