A numerical model is proposed for the influence of a volcanic eruption accompanied by an intense vertical flow of an ash-gas mixture on the disturbance of the geomagnetic field. As the main mechanism of the magnetic effect, the impact on the epicentral region of the Earth's ionosphere of wave atmospheric disturbances caused by volcanic activity is considered. The estimates made on the basis of the proposed model on the example of the eruption of the Raikoke volcano on June 21, 2019 (Kuriles) are consistent with the results of instrumental observations.
The high- speed jet of aluminum plasma is a calibrated source of impact in the Active Geophysical Rocket Experiment (AGRE) in the upper atmosphere. In the considered problem of jet injection, the gas dynamic parameters and the ionic composition of the plasma were determined. It was shown that in a rapidly expanding jet, a violation of thermodynamic equilibrium occurs, leading to the "freezing" of the ionic composition. During AGRE, the plasma of the jet interacts with the ionosphere and the geomagnetic field.
The problem of modeling the injection of an aluminum jet of a plasma generator into the upper atmosphere during an Active Geophysical experiment is considered. The high-speed jet is a calibrated source of exposure. The gas-dynamic parameters of the jet are calculated. It is shown that in a rapidly expanding jet a violation of thermodynamic equilibrium occurs, causing to "freezing" of the ionic composition. The plasma jet interacts with the atmosphere and the geomagnetic field, causing the glow, the formation of a "diamagnetic cavity", and the generation of electromagnetic waves.
The results of the analysis of the navigation task solution in the conditions of registration of the signals of the global navigation satellite systems GPS and GLONASS in the Mikhnevo GFO (the geophysical observatory) are presented. It is shown that in the classical algorithm, the choice of satellites from the observed constellation should be made not according to the criterion of elevation, but by the number of conditionality of the navigation task matrix. The use of adaptive iterative algorithms almost completely compensates geophysical perturbations while maintaining the twofrequency regime.
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