Solar-Terrestrial Physics Solar-Terrestrial Physics Solar-Terrestrial Physics 2500-0535 71493 10.12737/stp-101202404 Results of current research Results of current research Results of current research Effect of the NO concentration on the ratio I₅₅₇.₇/I₄₂₇.₈ in auroras Effect of the NO concentration on the ratio I₅₅₇.₇/I₄₂₇.₈ in auroras Иванов Владимир Евгеньевич Ivanov Vladimir Evgenievich ivanov@pgia.ru

доктор физико-математических наук;

doctor of physical and mathematical sciences;

 Дашкевич Жанна Владимировна Dashkevich Zhanna Vladimirovna zhanna@pgia.ru

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 Полярный геофизический институт РАН Апатиты Россия Polar Geophysical Institute, RAS Apatity Russian Federation Полярный геофизический институт Апатиты Россия Polar Geophysical Institute Apatity Russian Federation 26 03 2024 26 03 2024 10 1 29 33 08 11 2023 26 12 2023 https://naukaru.ru/en/nauka/article/71493/view

We have examined the effect of the nitrogen oxide concentration on the ratio between λ557.7 nm and λ427.8 nm emission intensities in auroras caused by precipitating electron fluxes, using the numerical simulation method. The ratio I₅₅₇.₇/I₄₂₇.₈ has been shown to strongly depend on the NO concentration: the ratio decreases from 7 to 2 with increasing NO maximum concentration at the height profile from 10⁷ to 3·10⁹. This fact is in satisfactory agreement with experimental data.The effect of nitric oxide on the ratio has been demonstrated to occur through the excitation channel of the emission λ557.7 nm, namely, the dissociative recombination of the molecular oxygen ion O⁺₂+eₜₕ due to the ion deactivation by collision reaction with nitric oxide O⁺₂+NO.

We have examined the effect of the nitrogen oxide concentration on the ratio between λ557.7 nm and λ427.8 nm emission intensities in auroras caused by precipitating electron fluxes, using the numerical simulation method. The ratio I₅₅₇.₇/I₄₂₇.₈ has been shown to strongly depend on the NO concentration: the ratio decreases from 7 to 2 with increasing NO maximum concentration at the height profile from 10⁷ to 3·10⁹. This fact is in satisfactory agreement with experimental data.The effect of nitric oxide on the ratio has been demonstrated to occur through the excitation channel of the emission λ557.7 nm, namely, the dissociative recombination of the molecular oxygen ion O⁺₂+eₜₕ due to the ion deactivation by collision reaction with nitric oxide O⁺₂+NO.

 nitric oxide 557.7 nm and 427.8 nm emissions intensity ratio aurora modeling electron precipitation nitric oxide 557.7 nm and 427.8 nm emissions intensity ratio aurora modeling electron precipitation

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