Please join us this Tuesday, June 20 in Physics 175 for our next presentation in our PEGASUS Summer Seminar Ser
Our next speaker is Caelia Gardiner, who studies oxygen spectral emissions in the mesosphere and lower thermosphere.
There will be cookies and refreshments served beforehand at 3:00 pm in the lounge for those attending the seminar.
Title: Oxygen A Band Emission in the SaskTran Radiative Transfer Framework
Oxygen emission is a contributor to day glow in the mesosphere and lower thermosphere (MLT). The emissions occur in the atmospheric band of oxygen, which ranges from 629 nm to 762 nm, and corresponds to oxygen’s second electronic excited state. There are three vibrational levels within the atmospheric band, with the A band representing the lowest level. Emissions in the A band are centred around 762 nm and are the most significant contributor to oxygen emissions in the atmospheric band. The SaskTran radiative transfer framework is a software model that simulates light propagation through the atmosphere to produce radiance profiles. While it currently includes oxygen absorption in the A band, oxygen emission has yet to be implemented. Modelling the volume emission rate of oxygen molecules in the A band by use of HITRAN data and photochemical processes will provide the information necessary to simulate oxygen emission with SaskTran. This work is also done in support of the Swedish satellite MATS (Mesospheric Airglow/Aerosol Tomography and Spectroscopy), which will take optical measurements of mesospheric gases. Understanding the process of oxygen A band emission through simulation and measurement will improve scientific understanding of the MLT and provide valuable data for other atmospheric study.