Bochum 2015 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 12: Helmholtz Graduate School for Plasma Physics I
P 12.5: Vortrag
Dienstag, 3. März 2015, 15:40–15:55, HZO 50
Quenching processes in terrestrial nightglow green line and Meinel band emissions in the MLT region — •Olexandr Lednyts’kyy and Christian von Savigny — Ernst-Moritz-Arndt-University of Greifswald, Greifswald, Germany
We consider terrestrial airglow emissions used for remote sensing of the chemical composition of the Earth’s upper mesosphere and lower thermosphere (MLT). Atomic oxygen concentration ([O]) profiles were retrieved from O(1S-1D) nightglow emission rates (provided by SCIAMACHY (SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY) on Envisat from August 2002 to April 2012 daily at approximately 22:00 local solar time) according to the 2-step Barth transfer scheme. A comparison between the retrieved [O] profiles and available reference [O] profiles enabled a selection of the most appropriate photochemical model. The Bates-Nicolet mechanism was applied to model the OH Meinel band emission layer in the MLT. The performed modeling confirms the previously considered assumption that collisional quenching of OH* by O causes vertical shifts of the OH layers. The retrieval results show that there is a significant correlation of solar forcing activity with [O] and [OH*] at high altitudes. Chemical reactions involved into both the 2-step Barth transfer scheme and the Bates-Nicolet mechanism were considered with account of quenching processes.