Variability of the Brunt–Väisälä frequency at the OH∗-airglow layer height at low and midlatitudes
Abstract. Airglow spectrometers as they are operated within the Network for the Detection of Mesospheric Change (NDMC, https://ndmc.dlr.de , for example, allow the derivation of rotational temperatures which are equivalent to the kinetic temperature, local thermodynamic equilibrium provided. Temperature variations at the height of the airglow layer are amongst others caused by gravity waves. However, airglow spectrometers do not deliver vertically-resolved temperature information. This is an obstacle for the calculation of the density of gravity wave potential energy from these measurements. As Wust et al. (2016) showed, the density of wave potential energy can be estimated from data of OH* airglow spectrometers if co-located TIMED-SABER (Thermosphere Ionosphere Mesosphere Energetics Dynamics, Sounding of the Atmosphere using Broadband Emission Radiometry) measurements are available since they allow the calculation of the Brunt-Vaisala frequency. If co-located measurements are not available, a climatology of the Brunt-Vaisala frequency is an alternative. Based on 17 years of TIMED-SABER temperature data (2002–2018) such a climatology is provided here for the OH* airglow layer height and for a latitudinal longitudinal grid of 10° × 20° at mid and low latitudes. Additionally, climatologies of height and thickness of the OH* airglow layer are calculated.