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The Cascade Demonstrator Small-Sat and Ionospheric Polar Explorer (CASSIOPE)satellite is scheduled to be launched in 2010. On board this satellite willbe a suite of eight scientific instruments comprising the enhanced PolarOutflow Probe (ePOP). One instrument is the Radio Receiver Instrument (RRI)which will be used to receive HF transmissions from various groundtransmitters such as the Super Dual Auroral Radar Network (SuperDARN) array.Magnetoionic polarization and propagation theory have been used to model therelative power that SuperDARN delivers to the Ordinary (O) and Extraordinary(X) modes of propagation. These calculations have been performed for variousfrequencies in the SuperDARN transmitting band and for all five Canadianbased SuperDARN radars. The geometry of the radars with respect to thebackground magnetic field results in the X-mode dominating the transmittedsignal when the modelled wave propagates northward and is nearlyperpendicular to the magnetic field lines. Other propagation directions(i.e., above or southwards of the radar) results in propagation which isanti-parallel to the magnetic field lines and an equal splitting oftransmitted power between the O- and X-modes occurs. The modelling analysisshows that for either high transmitting frequencies or low ionosphericelectron densities, the range of latitudes that signal will be received isquite large (up to ~90° of latitude). Also for these conditions,the range of elevations where the X-mode signal strongly dominates the O-modesignal will be apparent in the received signal. Conversely, for lowertransmitting frequencies or higher ionospheric electron densities, thelatitudinal range that signal will be received over is smaller. Here theX-mode-only band is not apparent in the received signal as both modes will bereceived with roughly equal power. These relative mode power calculations canbe used to characterize the average electron density content in theionosphere or provide a measure of relative absorption in the D- andE-regions when the satellite passes through the field-of-view of a SuperDARNradar

Relative O- and X-mode transmitted power from SuperDARN as it relates to the RRI instrument on ePOP