Observations of the signal strength of HF signals propagated over high latitude paths

The high latitude ionosphere is a highly dynamic and disturbed medium which can severely affect high frequency (HF) radio signals propagating through these regions. In order to investigate this type of propagation, a frequency agile transmitter has been installed well within the Polar Cap at Clyde River, NWT, Canada (70°N, 69°W). Five receiving and data logging systems have been deployed to provide four trans-auroral oval paths and one path contained entirely within the Polar Cap region. Variations observed in the measured signal strength at each of the receiving sites during two one-month experimental campaigns undertaken at different times of year have been investigated and the results outlined