Abstract
Abstract. Airglow spectrometers, as they are operated within the Network for the Detection
of Mesospheric Change (NDMC; https://ndmc.dlr.de, last access: 1 November 2020), 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 Wüst 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–Väisälä frequency. If co-located measurements are not
available, a climatology of the Brunt–Väisälä 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
midlatitudes and low latitudes. Additionally, climatologies of height and thickness
of the OH∗-airglow layer are calculated.
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