An Experiment to Study Electric and Electromagnetic Fields in the Frequency Range 10 Hz to 540 kHz on OGO-F

An experiment is described which will extend the frequency range over which "whistler-mode" waves have been observed in the ionosphere. The experiment uses an electric dipole antenna and will therefore also detect the essentially purely electric waves associated with the lower hybrid resonance noise bands. Emphasis is on broad-band observations which are made in the bands 0.01-15, 15-30, 92.5-107.5, and 280-295 kHz. The experiment also includes two narrow-band receivers (at 200 and 540 kHz) and a subsystem to measure the antenna impedance at four frequencies (8, 24, 104.5, and 285 kHz).