This paper presents the results of modeling the effect of the annular solar eclipse on June 10, 2021 on the highlatitude ionosphere. Comparison of modeling results was carried out with experimental data from the Vertical Sounding (VS) station of Zhigansk Ionospheric Station. The study shows variations of critical frequencies of the F2 layer during solar eclipse and their correlation with the numerical model data. Numerical modeling of the ionospheric plasma state was performed using a semi-empirical three-dimensional ionospheric model based on Euler formalism with a module for solar eclipse pre-calculation1. A protracted decrease was detected at critical frequencies of the F2 layer of the evening and night ionosphere layer after solar eclipse.
The paper presents a mathematical model of the ionosphere based on the Euler formalism, supplemented by a block for calculating the intensity and location of the lunarshadow on the Earth's surface during a solar eclipse. This allows considering the effects of a solar eclipse in the Earth's ionosphere on a global scale. The model enablesobtaining the ionospheric parameters of the upper ionosphere down to the low-latitude regions of the northern hemisphere. We present preliminary results of modeling for the mid-latitude region of the northern hemisphere and comparison of modeling data with data obtained from vertical sounding stations.
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