Doppler diagnostics of effects of solar flares in f-region of ionosphere of transient latitudes

The investigation is concerned with short-period variations of parameters of F2-region of ionosphere under various heliogeophysical conditions. The aim to be attained is study of effects of influence of solar flares on F2-region of ionosphere of transient latitudes. The methods of investigation and equipment include quasi-vertical sensing of ionosphere using multifrequency Doppler technique; automated multifrequency receiving-transmitting complex for measurement of Doppler shieft of frequency of radio waves reflected from ionosphere. A possibility of prompt diagnostics and short-term prediction of appearence and evoluation of active formations on the Sun based on the results of the ground Doppler measurements of short-period variations of parameters of F2-region of ionosphere has been shown. The first detected preflare wave perturbations of electron concentration in F2-region of ionosphere with periods of 6-12 min provide a possibility of short-term prediction of X-ray flares. The subject and level of introduction include prompt diagnostics and short-term prediction of X-ray flares. Significant economical efficiency is expected when predicting Sun-Earth links and ecological situation. The field of application covers radiophysics, Sun-Earth physics, ecologyAvailable from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio