We discuss the role and the usage of the ionosphere models in the improvement of UHF-SHF radar operation. The up-to-date empirical ionosphere models (International Reference Ionosphere (IRI), Fully Analytical Ionosphere Model (FAIM), Ne-Quick2) have too crude spatial and temporal resolution. The aforementioned models cannot describe the localized irregularities (like traveling ionospheric disturbances or waves) which, in turn, are regularly observed at the midlatitude high frequency chirp ionosonde. In the presence of such irregularities the additional range error in UHF range can exceed 1-2 km. The poorly known quasi-random nature of such irregularities leads us to the unique solution, namely, the rejecting of the laminar layered ionosphere in favor of the random electron density field. Such new probabilistic ionosphere model must be elaborated and verified on the experimental data.
The effect of infrasonic pulsed radiation from the Chelyabinsk bolide on the perturbations of the electron concentration in the D region of the Earth's ionosphere is considered. According to the electromagnetic measurements in the geophysical observatory Mikhnevo of the Institute of Geospheres Dynamics of Russian Academy of Science (IDG RAS), an estimate of the displacement of the reflection point of the SDV signals is obtained. Influence of infrasound radiation on the propagation of VLF signals on the Novosibirsk-Mikhnevo path is considered. The amplitude of the displacement of particles of the environment from infrasonic radiation is estimated. There is a good agreement between theoretical and experimental estimates.
The paper presents the results of an analysis of the frequency variations of the first mode of the of Schumann resonator in the geophysical observatory Mikhnevo of the Institute of Geospheres Dynamics of Russian Academy of Science (IDG RAS) during solar X-ray flares of the M and X classes in 2011 - 2017. It is shown that the frequency variation depends not only on the flash class, but also on the magnetic field component and local time. It is suggested that this is due to the geometry of the path from the African Thunderstorm Activity Center.