The paper presents the results of an analysis of variations in the effective reflection height h' on the X-ray energy in different spectral ranges during a series of X-ray flares that occurred from September 6 to 10, 1017. It is shown that the effective reflection height h' depends on the X-ray energy in the range up to 0.2 nm. During the period from September 6 to September 10, the parameters of the ionosphere changed significantly - the absorption of X-ray radiation at heights above the D-layer increased.
This paper presents the perennial results of ionospheric vertical total electron content (TEC) variations using the Global Navigation Satellite System (GNSS) data from the Geophysical Observatory «Michnevo». TEC long data analysis revealed a TEC annual variations and TEC decreasing trend caused by the decline in solar activity during the observation period. Spectral analysis allowed to identify 27 TEC daytime variations, which can be directly related to the period of sun rotation around its axis. Also the TEC distribution from the UV solar radiation flux was made. The linear dependence of the TEC value on the UV flux can be explained by the fact, that UV solar radiation is the main ionization agent of the F region ionosphere.
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