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A wave interference experiment with HAARP, HIPAS, and WIND

We report on the first experiment using two high power, high frequency transmitting facilities in a bistatic, interferometer mode. The HAARP and HIPAS facilities in Alaska radiated at 4525 kHz with total combined power of about 700 kW, in the direction of the WIND spacecraft. The WAVES experiment aboard WIND received the transmissions at a distance of about 25 earth radii. The experimental setup thus resembled Young's two‐slit experiment. The expected interference pattern was observed; at the distance of WIND, the fringe size was about 30 km peak to peak.