MODIFICATION OF THE IONOSPHERE BY RADIOWAVES
RAND CORP SANTA MONICA CA
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A theoretical model is presented for calculating the heating and hydrodynamic expansion of the F-layer of the ionosphere due to an incident radiowave. We find that the greatest effects occur for transmitter frequencies just above the critical frequency of the F-layer. Using a power aperture product of 1,000 sq megawatt-meter, which corresponds to a projected experiment by ESSA at Boulder, Colorado, we find a maximum increase in the electron temperature at the peak of the F-layer of about thirty percent with a reduction in the electron density of about ten percent. The time scale for achieving the density changes is predicted to be about one-half hour to an hour.
- Atmospheric Physics
- Electromagnetic Pulses