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How frequently is the HF transmitter used?
The HF Transmitter is used during research campaigns to support interactive study of the ionosphere. A typical research period may last one or two weeks and up to four such campaigns may occur in a given year.
Originally posted by danman23
reply to post by shasta9600
That is some of the info I am referring to.. do some research on Bernard Eastlund.. his patent... shoot.. watch this video.. there is an interview with him and some guys from HAARP www.youtube.com...
All transmitted frequencies above this critical frequency will penetrate the layer without being reflected. Their group velocity will however, will be slowed by any ionisation, and this will add to the time-of-flight. If such a wave encounters another layer, whose plasma frequency is higher than the frequency of the wave, it will be reflected, and the return signal will be further delayed as it travels back through the underlying ionisation. The apparent, or virtual height indicated by this time delay will therefore be greater than the true height. The difference between true-height and virtual height is governed by the amount of ionisation that the wave has passed through. Recreating the true-height profile of electron concentration from ionogram data is an important use of ionosonde data. Such a procedure is known as true height analysis.