Solar-Terrestrial Physics Solar-Terrestrial Physics Solar-Terrestrial Physics 2500-0535 67088 10.12737/stp-94202312 Results of current research Results of current research Results of current research Photodetachment rates for O⁻ and O₂⁻ in the D layer of the ionosphere as function of solar zenith angle and solar activity Photodetachment rates for O⁻ and O₂⁻ in the D layer of the ionosphere as function of solar zenith angle and solar activity 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;

 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 28 12 2023 28 12 2023 9 4 95 98 03 07 2023 05 09 2023 https://zh-szf.ru/en/nauka/article/67088/view

We present the results of calculation of photodetachment rates for negative ions in the D layer of the ionosphere, using recent photodetachment cross-section measurements. The calculations have been made for the standard atmosphere by means of the TUV (Terrestrial UltraViolet) code. We have obtained dependences of the photodetachment rates on altitude and solar zenith angle. The nonlinear nature of these dependences causes similar variations in the role of the photodetachement processes with altitude and solar zenith angle as compared to other processes in the middle atmosphere and the lower ionosphere, especially under terminator conditions. Calculations with solar spectrum for 2011–2020 for the summer/winter solstice and the spring/autumn equinox have shown no quantitative difference between the photodetachement rates for ions in the D layer of the ionosphere.

We present the results of calculation of photodetachment rates for negative ions in the D layer of the ionosphere, using recent photodetachment cross-section measurements. The calculations have been made for the standard atmosphere by means of the TUV (Terrestrial UltraViolet) code. We have obtained dependences of the photodetachment rates on altitude and solar zenith angle. The nonlinear nature of these dependences causes similar variations in the role of the photodetachement processes with altitude and solar zenith angle as compared to other processes in the middle atmosphere and the lower ionosphere, especially under terminator conditions. Calculations with solar spectrum for 2011–2020 for the summer/winter solstice and the spring/autumn equinox have shown no quantitative difference between the photodetachement rates for ions in the D layer of the ionosphere.

 ionosphere D layer photodetachment ionosphere D layer photodetachment The work was financially supported by the Ministry of Science and Higher Education of the Russian Federation (FNWM-2022-0021) The work was financially supported by the Ministry of Science and Higher Education of the Russian Federation (FNWM-2022-0021)

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