Abstract
In recent years methods of producing controlled modifications of the ionosphere by use of high-intensity radio-frequency waves have been proposed; some have been tried with inconclusive results. The present paper describes detection of significant (∼30%) changes in the electron temperature in the F2 region produced by absorption of radio-frequency energy propagated at or near the local ionospheric plasma frequency. The radio-frequency source is the 1-Mw cw transmitter and ∼16° beamwidth antenna array described in the accompanying paper by Utlaut [1970]. As shown by the calculations of Meltz and LeLevier [1970], electron temperature increases of ∼35% can be expected within a few tens of seconds after the transmitter, tuned to within 1% of f0F2, is turned on.
Published Version
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