The Doppler-Ionosonde will “sound” or resonate the ionospheric layer and record delay times of the returned signal. The collected data is averaged and plotted showing graphically the density and behavior of the ionosphere. This layer is known to have seasonal stability but is extremely sensitive to atmospheric changes. There is much interest in the radio communications world as to what conditions cause the layer to form.

This phase-sensitive ionosonde will also record signals bounced back from Noctilucent Clouds which are present only during the Arctic summer.