Mid-latitude ionospheric scintillation of geostationary satellite signals at 137 MHz.

The results are given of a twelve-month series of scintillation measurements at a frequency of 137 MHz, using signals from a quasi-geostationary satellite. In addition to the usual night-time maximum in the occurrence of scintillations, a pronounced daytime maximum was observed at all seasons. A spaced-aerial receiving system was used, enabling the geometrical statistics of the ground diffraction pattern, and hence those of the ionospheric irregularities, to be investigated. A combination of these results with the observed frequency spectra confirmed the F-region and E-region origins, respectively, of the night-time and daytime scintillations.