Quote:
Originally Posted by FrankM
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The DEMETER satellite can detect emissions in real time, when it is overhead, but that one satellite cannot triangulate the ground area which had the emission.
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Hey Frank.
I was checking out the DEMETER site tonight and found this little bit in their News. It sounds like they can triangulate to me? Any idea why the US military is heating the ionosphere over Austrailia?
News DEMETER
Quote:
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Originally Posted by DEMETER
NWC in Australia is a very powerful transmitter of the US army (1000 kW) which sends waves at 19.8 kHz. The figure shows the perturbations induced in the ionosphere by this transmitter around 14.52.30 UT. These perturbations are registered when DEMETER is close. The top panel represents a spectrogram in the HF (High Frequency) range where we can observe a characteristic frequency of the plasma which is excited around 1.8 MHz. The following panel shows a VLF (Very Low Frequency) spectrogram of an electric component with a dramatic increase of the signal over all the frequency range (the transmitter frequency can be observed at 19.8 kHz). Then the electronic density and temperature measured by the Langmuir probe are plotted. The curves indicate a large variation of these ionospheric parameters as in the bottom panel which shows the ion temperature measured by the plasma analyzer. During two years more than fifty typical events as this one have been registered and the orbit projections at the time of the perturbations have been plotted on the following map.
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