Articles | Volume 40, issue 1
https://doi.org/10.5194/angeo-40-23-2022
https://doi.org/10.5194/angeo-40-23-2022
Regular paper
 | 
20 Jan 2022
Regular paper |  | 20 Jan 2022

Long-term studies of mesosphere and lower-thermosphere summer length definitions based on mean zonal wind features observed for more than one solar cycle at middle and high latitudes in the Northern Hemisphere

Juliana Jaen, Toralf Renkwitz, Jorge L. Chau, Maosheng He, Peter Hoffmann, Yosuke Yamazaki, Christoph Jacobi, Masaki Tsutsumi, Vivien Matthias, and Chris Hall

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Subject: Terrestrial atmosphere and its relation to the sun | Keywords: Long-term changes and trends
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Cited articles

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Short summary
To study long-term trends in the mesosphere and lower thermosphere (70–100 km), we established two summer length definitions and analyzed the variability over the years (2004–2020). After the analysis, we found significant trends in the summer beginning of one definition. Furthermore, we were able to extend one of the time series up to 31 years and obtained evidence of non-uniform trends and periodicities similar to those known for the quasi-biennial oscillation and El Niño–Southern Oscillation.