: Contents: Results of observations made during the IGY; Frequency-separated reception and its combination with spatial separation; Method of complete correlation analysis; Volumetric correlation analysis.

Irregularity structure and movement in the ionosphere (selected passages)

Solar activities including solar radiations affects not only the electron content of the ionosphere but also the various frequencies used in telecommunications. The alternating voltages of the frequency modulation (FM) in Ahamdu Bello University radio station was obtained during the period of three months from July to September 2019. The variation of all prominent peaks of the electron density begins during sunrise and sunset, where most of the peaks shows weak signal strength during the daytime i.e. at 16,000N/m3 compared to night time and morning time at 0.00N/m3 and 0.00N/m3 respectively. The results showed that this station have all day signal strength, while night time show variability in signal strength. This observation may be attributed to the solar activity in the atmosphere. We calculated the critical frequency and hence find the Maximum Usable Frequency (MUF) and conclude that solar radiation factor give the minimum significant effect to radio signals.

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The effect of solar radiation on the signal strength of a.b.u. samaru radio station

The lower polar ionosphere research are carried out by the modified measuring complex of the observatory Tumanny (69.0 degree(s)N, 35.7 degree(s)E) since 1999. It were performed an analysis of the dynamical processes caused by the neutral gas motion, preliminary investigation of statistical and spectral characteristics of the backscattered waves and, furthermore, variations of the electron density were calculated. The areas, where the electron density irregularities with scales more than 100 m at heights from 70 till 99 km were groped, were detected by the spaced sensors measurements of the backscattered waves. During the solar eclipse of 1999 August 11 for the short time the increased radioecho intensity was observed at the heights near the mesopause.

O. F. Ogloblina

Papers

Lower polar ionosphere research by the partial radioreflections technique