Studies of the structure and dynamics of theDregion of the polar ionosphere during solar flares in April 2004

[1] The results of observations of the polar lower ionosphere by the partial reflection method during moderate solar flares in April 2004 are presented. The structure of the electron concentration profile in the ionospheric D region and the effects of the impact on it of X-ray radiation of the flares both in quiet and disturbed conditions are considered. It is shown that at altitudes below 75 km the electron concentration is proportional to the intensity of X-ray radiation from a solar flare. This manifests the existence of a linear recombination law at these heights.