Abstract
The results of are presented of determining the height profiles of electron concentration $$N(h)$$ during the daytime solstice of June 19–30, 2015. Dependences of $$N(h)$$ recorded in a calm state and the presence of sporadic structures of varying intensity are given. The histograms of the distribution of the variable plasma concentration for four values of the height of the lower ionosphere were determined. It is shown that, at an altitude of 100 km, an increase in the electron concentration by a factor of 4–5 occurs under the action of an X-ray flare from the Sun. Manifestations of different types of sporadic formations in changes in the amplitude of radio signals are considered and three types of amplitude variations characteristic of sporadic structures are identified.
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