The effect of solar flares on the ionosphere of the Earth during 24th cycle of solar activity

This work describes of ionospheric effects from the data of global navigation satellite systems of a number of solar flares of different power classes (X-, M-, C-class) during 2014-2017. Our results demonstrate that the algorithm of averaging the derivative of the variations of the total electron content for all stations on the illuminated side of the Earth can exactly detect of X-сlass flares and with sufficient accuracy for practice detect of M-class flares in the automatic mode (the «signal skip» error is approximately 2.76%). Also shown that in some cases the variability of the ionospheric response is a consequence of the difference in the dynamics of solar radiation in the X-ray and ultraviolet frequency ranges.