The role is considered of all known potential sources of excitation of the 1D term of atomic oxygen in auroras and the value of their relative contributions to the emission intensity of 630.0-nm emission in the height interval of 100−300 km. The main attention is paid to the role of weak excitation sources of 1D terms, such as collisional interactions between the components of atmospheric gases N(2D) + O, N(2D) + O2,N(2P) + O2, and N+ + O2; direct electron impact O2 + e*; and the radiative transition O(1S) → O(1D) + hν557.7. It is shown that, despite the small partial contributions of these sources to the intensity of the 630.0-nm emission, their total contribution can be quite significant. The total efficiency of these sources varies from 66 to 6% with an increase in altitude from 100 to 300 km and is significant at altitudes below 200 km. It is shown that the influence of the decontamination process leads to the fact that, in the region of heights of ∼110−150 km, the set of reactions of collisional interactions of ionospheric plasma components N(2D) + O, N(2D) + O2,N(2P) + O2, and N+ + O2 becomes the second most efficient source contributing to the intensity of the 630.0-nm emission.
Analysis of 630.0-nm Emission Sources in Auroras
Cosmic Res
Cosmic Research ; 60 , 5 ; 332-339
2022-10-01
8 pages
Article (Journal)
Electronic Resource
English
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