TY - JOUR A1 - Jaen, J. A1 - Renkwitz, T. A1 - Chau, J. L. A1 - He, M. A1 - Hoffmann, P. A1 - Yamazaki, Y. A1 - Jacobi, C. A1 - Tsutsumi, M. A1 - Matthias, V. A1 - Hall, C. T1 - 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 JO - Ann. Geophys. J1 - ANGEO VL - 40 IS - 1 SP - 23 EP - 35 Y1 - 2022/01/20 PB - Copernicus Publications SN - 1432-0576 UR - https://angeo.copernicus.org/articles/40/23/2022/ L1 - https://angeo.copernicus.org/articles/40/23/2022/angeo-40-23-2022.pdf DO - 10.5194/angeo-40-23-2022 ER -