Characteristics of the influence of pulsating precipitations on ultrashort-wave radio signals

Physics

Scientific paper

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Ionospheric Propagation, Nocturnal Variations, Radio Signals, Short Wave Radiation, Auroral Zones, Histograms, Signal Fading, Temporal Distribution

Scientific paper

A zenith-directed riometer located at the Apatity station observed ultrashort-wave signals, correlated with optical auroral pulsations, on the night of February 28 to March 1, 1981. A qualitative interpretation of the observed phenomenon is presented: irregularities allowing the propagation of ultrashort-wave signals are formed in the E-region due to ion production (whose rate is proportional to the auroral intensity) at some lower threshold value of auroral intensity. The signal is absorbed if there is additional ionization at lower heights; this absorption can determine the upper threshold.

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