Modelling of spatial temporal variations of dynamic and thermal process parameters in geospace over Ukraine during the minimum of 24th cycle of solar activity (2009, 2019)

1Kolodyazhnyi, VV, 2Lyashenko, MV, 3Emelyanov, LYa., 1Dzyubanov, DA
1National Technical University «Kharkiv Polytechnic Institute», Kharkiv, Ukraine
2Institute of Ionosphere of the National Academy of Sciences of Ukraine and Ministry for Education and Sciences of Ukraine, Kharkiv, Ukraine
3Institute of Ionosphere of the National Academy of Sciences of Ukraine and Ministry of Education and Science of Ukraine, Kharkiv, Ukraine
Space Sci. & Technol. 2023, 29 ;(1):15-35
Publication Language: Ukrainian
Modelling of spatiotemporal variations of parameters of dynamic and thermal processes in ionospheric plasma on the phases of the minimum of the 24-th cycle of solar activity according to the Kharkiv radar of incoherent scattering is performed. For typical geophysical periods (vernal and autumn equinoxes, summer and winter solstices) the diurnal dependences of parameters of the processes in the ionospheric plasma at altitudes from 210 to 450 km are constructed. The analysis of spatial and temporal variations of parameters of dynamic and thermal processes in the ionosphere is given.
       The value of the plasma transfer velocity due to ambipolar diffusion, the density of the full plasma flux and the flux of charged particles due to ambipolar diffusion, the value of the energy supplied to the electron gas, the density of the heat flux transferred by electrons from the plasmasphere to the ionosphere, as well as the velocity of the equivalent neutral wind, and the meridional component of the neutral wind velocity were calculated.
       It was found that for most of the studied periods, weak variations in space weather do not lead to significant changes in spatiotemporal variations of the parameters of dynamic and thermal processes in the ionosphere. Quantitative and qualitative characteristics of most of these parameters and their diurnal variations were typical for the considered seasons. On the contrary, the velocity of the equivalent neutral wind changed significantly (up to 2—2.5 times) even with a weak increase in geomagnetic activity. The reasons for such changes may be the strengthening of horizontal thermospheric winds and the penetration of zonal magnetospheric electric fields into midlatitudes during the equinoxes.
        The obtained results of calculations can be used in basic studies of solar-terrestrial relations and geospace, to solve applied problems related to the ability to predict the state of space weather, as well as to further develop the regional ionosphere model CERIM IION.
Object of research: physical processes in ionospheric plasma.
Subject of research: spatiotemporal dependences of the main parameters of ionospheric plasma, which were obtained using incoherent scattering radar.
        Research methods — terrestrial radiophysical method of incoherent scatter of radio waves, statistical analysis of observation results, semi-empirical modelling of parameters of dynamic and thermal processes.
Keywords: ionosphere, ionospheric modelling, parameters of dynamic and thermal processes, physical processes in ionospheric plasma, radiophysical methods of geospace research, solar activity
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