Magnetic-ionospheric effects of partial solar eclipse of October 25, 2022 over Ukraine
Abstract
Urgency. The near-Earth environment, which is part of the Earth–atmosphere–ionosphere–magnetosphere (EAIM) system, is the main functioning radio channel. It is used by radio communications, radio navigation, radar, remote sensing, and radio astronomy systems. The EAIM system and radio channel are rarely in a quiet state. From time to time they become disturbed by high energy sources. One of them is a solar eclipse (SE). Although the disturbance of the EAIM system by a solar eclipse has been studied for more than a hundred years, the study of the entire set of effects in this system remains an urgent task. This is due to the fact that the effects of an SE significantly depend on the eclipse magnitude, the state of space weather, position in the solar activity cycle, time of year, time of day, geographic coordinates, etc.
The aim of this paper is to describe the results of the study of temporal variations in the components of the geomagnetic field and total electron content (TEC) in the ionosphere that accompanied the partial SE on October 25, 2022 over Ukraine.
Methods and Methodology. The registration results of X-, Y- and Z-components of the geomagnetic field at the Lviv station and the results of measuring the parameters of radio signals from the Global Navigation Satellite System in Kharkiv were used as initial data. Temporal resolution was 1 min. The error in measuring the level of geomagnetic components is 0.1 nT, and for TEC it is 0.1 TECU.
Results. The SE over Ukraine caused aperiodic disturbances in the components of the geomagnetic field, which reached 2–3 nT. The greatest disturbance was observed in the X-component, and the smallest in the Z-component. The duration of the disturbance was 80–100 min. The SE was accompanied by quasi-periodic disturbances of the geomagnetic field components. The amplitude of oscillations with a period of 30±5 min and a duration of 70–80 min reached 2 nT. The SE caused a decrease in TEC from ~24 to ~18 TECU. The delay time of the TEC response to the SE was about 14 min. On average, the linear recombination coefficient was close to 1.2×10–3 s–1. The results of the assessment of magnetic and ionospheric effects are in good agreement with the observational results.
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References
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