D. S. Kushnarev

Development of Diagnostic Capabilities of the Irkutsk Incoherent Scattering Radar

A description of the incoherent scattering radar of the Institute of Solar-Terrestrial Physics, Siberian Branch of Russian Academy of Sciences is given. New diagnostic capabilities attained as a result of modernization are described. The types of measurements are considered to be performed using this facility when studying the upper atmosphere of the Earth and the near-Earth space.

Method for studying the spatial-temporal structure of wave-like disturbances in the ionosphere

The method for studying the spatial-temporal structure and propagation characteristics of traveling ionospheric disturbances, using the spectral and cross-correlation analysis of electron density disturbances at different altitudes, obtained with the incoherent scatter radar and vertical sounding ionosonde, is considered. Different algorithms for detecting traveling ionospheric disturbances and calculating the total vector of the disturbance propagation velocity are presented. The results of the method application have been considered in detail, using September 11, 2005, as an example.

Recording and control digital systems of the Irkutsk Incoherent Scatter Radar

A brief technical description of the Irkutsk Incoherent Scatter Radar of the Institute of Solar-Terrestrial Physics (Siberian Branch, Russian Academy of Sciences) is given. New diagnostic capabilities resulting from the radar upgrade are presented. Types of measurements for the Earth’s upper atmosphere and near-Earth space studies are described.

Correlation method for determining the ionospheric plasma drift velocity at the Irkutsk Incoherent Scatter Radar

The correlation method for processing the Irkutsk Incoherent Scatter Radar (IISR) data and the method for calculating the ionospheric plasma drift velocity are described. The properties of the complex autocorrelation function of an incoherent scatter signal are considered. The IISR data for September 2005 are analyzed.

Comparison of the Electron Density Variations Measured with Instruments of the ISZF SO RAN Radar Complex under the Conditions of Different Geomagnetic Disturbance

The variations in the electron density measured with the incoherent scatter radar, DPS-4 digisonde, and FMCW ionosonde are compared in this work. The main regularities in differences are explained by the effect of different-scale ionospheric irregularities. Considerable morning gradients of electron density result in that ionosondes give increased values as compared to the incoherent scatter radar data. Electron density disturbances measured with different instruments can be of correlated and uncorrelated character. Uncorrelated disturbances are explained by intense medium-scale ionospheric irregularities. Correlated disturbances are caused by large-scale irregularities. Observation of such disturbances can be used to determine the velocity and direction of a disturbance.

Analyzing the characteristics of phase-shift keyed signals applied to the measurement of an electron concentration profile using the radiophysical model of the ionosphere

The radiophysical model of the ionosphere, which can approximately imitate the ionospheric response to a sounding signal, is presented. The model mathematical description and input parameters are given. The results of modeling the ionospheric response to different types of sounding signals are presented. The methods for estimating the quality of restoration of an initial power profile are described. The optimal characteristics of the signal, which allows for a high-quality restoration of an initial power profile, and the modeling results are presented.