A Satellite Instrument Proposal for Radar Observations of the Terrestrial Ionosphere

Physics

Scientific paper

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6929 Ionospheric Physics (1240, 2400), 6934 Ionospheric Propagation (0689, 2487, 3285, 4275, 4455), 6964 Radio Wave Propagation, 6982 Tomography And Imaging (7270, 8180), 6994 Instruments And Techniques (1241)

Scientific paper

The Radio Receiver Instrument (RRI) experiment on the enhanced Polar Outflow Probe (ePOP) scientific payload of the upcoming CSA (Canadian Space Agency) CASSIOPE (Cascade Demonstrator Small-Sat and Ionospheric Polar Explorer) satellite mission, which is to be launched in early 2008, will help clarify the propagation of radio waves through the ionosphere and the scattering processes of radio waves in the ionosphere. In light of the RRI experiment the benefit of a second experiment has become obvious. The RRI is a passive radio system receiving radio waves from transmitters located on the ground. Our proposed new satellite instrument would be an active radar system with the additional ability to obtain either radar backscatter or reflections from ionospheric structures. Coherent scatter radar observations of the ionosphere have rarely, if ever, been observed from a satellite platform, although they are routinely observed with radar systems on the ground such as the network of SuperDARN HF radars. Observing simultaneous radar observations of the same scattering volume in the ionosphere at either auroral or polar latitudes from both ground and space-borne platforms could be achieved with SuperDARN and our proposed active satellite radar system. Further to this, the proposed satellite radar could operate as a topside sounder or ionosonde (reflection radar) with near global coverage of the terrestrial ionosphere when not operating as a coherent scatter radar. There are no current topside sounder observations and have not been any on a regular basis since the ISIS II mission ended in the early 1990s. Such observations are of significant scientific interest and would complement the International Reference Ionosphere (IRI) model and TEC measurements made with GPS receivers or other radio beacons. This paper will present the proposed active radio satellite instrument and will discuss the expected science.

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