Lecturer: Peter Dalin (IRF) Date: 2024-01-11 10:00 Place: Aniara
A novel infrared imager for studies of hydroxyl and oxygen nightglow emissions in the mesopause above northern Scandinavia
Peter Dalin
Swedish Institute of Space Physics
The seminar is also online. See emails for connection details.
Abstract:
We describe technical characteristics and first scientific results of a novel infrared imaging system (imager) for studies of nightglow emissions coming from hydroxyl (OH) and molecular oxygen (O2) layers in the mesopause region (80-100 km) above northern Scandinavia. The OH imager was put into operation in November 2022 at IRF in Kiruna. The OH imager records selected emission lines in the OH (3-1) band near 1500 nm to obtain intensity and temperature maps at around 87 km altitude. Also, the OH imager registers infrared emissions coming from the O2 IR A-band airglow at 1268.7 nm in order to obtain O2 intensity maps at a slightly higher altitude around 94 km. This technique allows tracing wave disturbances both in horizontal and vertical domains in the mesopause region. Validation and comparison of the OH (3-1) rotational temperature with collocated lidar and Aura/MLS satellite temperatures have been performed. First scientific results obtained with the OH imager for the first winter season (2022-2023) are discussed.
Created 2023-06-08 11:05:49 by Mats Holmström Last changed 2024-01-04 09:03:15 by Mats Holmström
