Hannover 2016 – scientific programme
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P: Fachverband Plasmaphysik
P 23: Helmholtz Graduate School for Plasma II
P 23.5: Talk
Thursday, March 3, 2016, 16:10–16:25, b302
O(1S) formation and loss processes in the terrestrial nightglow — •Olexandr Lednyts’kyy and Christian von Savigny — Ernst-Moritz-Arndt-University of Greifswald, Greifswald, Germany
The retrieval of atomic oxygen concentration ([O]) profiles was performed with help of volume emission rate (VER) profiles calculated from the measured by SCIAMACHY (SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY) emissions of green line nightglow in the MLT (Mesosphere/Lower Thermosphere) region. To reflect complex molecularity of the green line emissions we discussed quenching profiles that correspond to retrieved [O] profiles. The peak of a VER profile is placed approximately at the altitude of the maximum of an [O] profile, where the contributions of the O and O2 quenching processes are similar. However, the [O]:[O2] ratio was observed to be low (at lower altitudes, where VER values are proportional to [O]3) and high (at higher altitudes, where VER values are proportional to [O]2[M]) in dependence on pressure and temperature. So, fast collisional relaxation dominate the radiative deactivation of both O2* and O(1S) metastable species at low altitudes and vice versa at high altitudes. However, in the [O] retrieval according to the well-known cubic equation it is assumed that laboratory measured reaction rates of quenching processes can be represented in dependence on temperature only. Nevertheless, we applied the extended cubic equation in the [O] retrieval to reflect the pressure and temperature dependence of the laboratory measured reaction rates of quenching processes under atmospheric conditions in the MLT region.