极光中 NO 浓度对 I₅₅₇.₇/I₄₂₇.₈比率的影响

Pub Date : 2024-03-26 DOI:10.12737/stp-101202404

Vladimir Ivanov, Zhanna Dashkevich

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引用次数: 0

摘要

我们利用数值模拟方法研究了氧化氮浓度对电子通量沉淀引起的极光中 λ557.7 nm 和 λ427.8 nm 发射强度比值的影响。结果表明，I₅₅₇.₇/I₄₂₇.₈的比值与 NO 浓度密切相关：在 10⁷ 到 3-10⁹ 的高度剖面上，随着 NO 最大浓度的增加，比值从 7 降到 2。一氧化氮对比率的影响已被证明是通过发射 λ557.7 nm 的激发通道发生的，即分子氧离子 O⁺₂+eₜₕ与一氧化氮 O⁺₂+NO碰撞反应导致离子失活而发生的离解重组。

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Effect of the NO concentration on the ratio I₅₅₇.₇/I₄₂₇.₈ in auroras

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.

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