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