Dispersion properties of moving ionospheric perturbations
Abstract
The phase and group velocities of moving perturbations caused by distant distributed and point sources are analyzed. Horizontally moving perturbations in a thin layer are found to have the form of quasimonochromatic waves with frequency and wave number related as k = omega(2)t/omega sub g z. This relationship can be viewed as a dispersion equation which, for a fixed t, defines the group velocity of horizontally moving perturbations: d omega/dk = r/zt. The basic parameters of moving perturbations (in a flat ionospheric layer) associated with acoustic gravity waves from a localized pulse mass source are estimated. Horizontally moving ionospheric perturbations are found to have the same structure as pressure wave perturbations in a neutral atmosphere and will consequently have the same dispersion properties as are established for acoustic waves.
 Publication:

USSR Rept Electron Elec Eng JPRS UEE
 Pub Date:
 December 1984
 Bibcode:
 1984RpEEE.......11G
 Keywords:

 Gravity Waves;
 Traveling Ionospheric Disturbances;
 Wave Dispersion;
 Acoustic Propagation;
 Group Velocity;
 Phase Velocity;
 Point Sources;
 Wave Equations;
 Communications and Radar