Solar-Terrestrial Physics Solar-Terrestrial Physics Solar-Terrestrial Physics 2500-0535 113883 10.12737/stp-121202611 abfwdb Results of current research Results of current research Results of current research A semi-empirical approximate method for studying some issues of aeronomy of the ionospheric D-region. III. Detailed analysis of the photochemistry of the environment under conditions of increased ionization A semi-empirical approximate method for studying some issues of aeronomy of the ionospheric D-region. III. Detailed analysis of the photochemistry of the environment under conditions of increased ionization Козлов Станислав Иванович Kozlov Stanislav Ivanovich s_kozlov@inbox.ru

доктор физико-математических наук;

doctor of physical and mathematical sciences;

 Ляхов Андрей Николаевич Lyakhov Andrey Nikolaevich alyakhov@idg.chph.ras.ru

кандидат технических наук;

candidate of technical sciences;

 Николайшвили Сергей Шотаевич Nikolaishvily Sergey Shotaevich ser58ge@mail.ru Яким Валентин Васильевич Yakim Valentin Vasilyevich 12-220@list.ru Научно-исследовательский испытательный центр ЦНИИ ВКС МО РФ Москва Россия Central Research Institute of Aerospace Forces, Ministry of Defense of the Russian Federation Moscow Russian Federation Институт динамики геосфер имени академика М.А. Садовского РАН Москва Россия Sadovsky Institute of Geosphere Dynamics RAS Moscow Russian Federation Институт динамики геосфер имени академика М.А. Садовского РАН Москва Россия Sadovsky Institute of Geosphere Dynamics RAS Moscow Russian Federation Институт динамики геосфер имени академика М.А. Садовского РАН Москва Россия Sadovsky Institute of Geosphere Dynamics RAS Moscow Russian Federation Институт прикладной геофизики имени академика Е.К. Федорова Москва Россия Fedorov Institute of Applied Geophysics Moscow Russian Federation Институт динамики геосфер имени академика М.А. Садовского РАН Москва Россия Sadovsky Institute of Geosphere Dynamics RAS Moscow Russian Federation 25 03 2026 25 03 2026 12 1 98 104 04 07 2025 15 10 2025 https://naukaru.ru/en/nauka/article/113883/view

Using the previously proposed semi-empirical method (Kozlov et al., 2022; Kozlov, Nikolaishvili, 2024), which is a fairly simple mathematical model (a system of five algebraic equations for calculating the concentrations of primary and cluster positive ions, primary and complex negative ions, as well as the electron density), we have calculated the ionospheric parameters that determine the behavior of the D-region under conditions of increased ionization (Solar Proton Events (SPE) on November 2–5, 1969, and the High-altitude Nuclear Explosion (HNE) conducted in 1962). Detailed analysis of the obtained parameter values has shown that the calculation results do not contradict the generally accepted photochemical mechanisms occurring under the SPE and HNE conditions considered. We identified the main trends in the changes of these parameters. A conclusion is made about the possibility of using the semi-empirical method in various heliogeophysical conditions and the need to develop a model for the transitional time of day (morning and evening twilight), and some possible directions for further research are outlined.

Using the previously proposed semi-empirical method (Kozlov et al., 2022; Kozlov, Nikolaishvili, 2024), which is a fairly simple mathematical model (a system of five algebraic equations for calculating the concentrations of primary and cluster positive ions, primary and complex negative ions, as well as the electron density), we have calculated the ionospheric parameters that determine the behavior of the D-region under conditions of increased ionization (Solar Proton Events (SPE) on November 2–5, 1969, and the High-altitude Nuclear Explosion (HNE) conducted in 1962). Detailed analysis of the obtained parameter values has shown that the calculation results do not contradict the generally accepted photochemical mechanisms occurring under the SPE and HNE conditions considered. We identified the main trends in the changes of these parameters. A conclusion is made about the possibility of using the semi-empirical method in various heliogeophysical conditions and the need to develop a model for the transitional time of day (morning and evening twilight), and some possible directions for further research are outlined.

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