Articles | Volume 13, issue 9
Atmos. Meas. Tech., 13, 5117–5128, 2020
https://doi.org/10.5194/amt-13-5117-2020
Atmos. Meas. Tech., 13, 5117–5128, 2020
https://doi.org/10.5194/amt-13-5117-2020

Research article 29 Sep 2020

Research article | 29 Sep 2020

Intra-annual variations of spectrally resolved gravity wave activity in the upper mesosphere/lower thermosphere (UMLT) region

René Sedlak et al.

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Short summary
Gravity wave (GW) activity in the UMLT in the period range 6-480 min is calculated by applying a wavelet analysis to nocturnal temperature time series derived from OH* airglow spectrometers. We analyse measurements from eight different locations at different latitudes. GW activity shows strong period dependence. We find hardly any seasonal variability for periods below 60 min and a semi-annual cycle for periods longer than 60 min that evolves into an annual cycle around a period of 200 min.