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from the Advanced Mesospheric Temperature Mapper (AMTM), which remained stationary for several hours ( Pautet et al. 2016 ). Simultaneous lidar measurements of sodium mixing ratios in the mesosphere and lower thermosphere (MLT) indicate peak gravity wave amplitudes of ≈±10 K at z ≈ 83 km and λ x ≈ 40 km. Later flight legs show strong indications of gravity wave breaking, with apparent vortex ring formation and momentum fluxes estimated over 320 m 2 s −2 ( Pautet et al. 2016 ). Eckermann et al
from the Advanced Mesospheric Temperature Mapper (AMTM), which remained stationary for several hours ( Pautet et al. 2016 ). Simultaneous lidar measurements of sodium mixing ratios in the mesosphere and lower thermosphere (MLT) indicate peak gravity wave amplitudes of ≈±10 K at z ≈ 83 km and λ x ≈ 40 km. Later flight legs show strong indications of gravity wave breaking, with apparent vortex ring formation and momentum fluxes estimated over 320 m 2 s −2 ( Pautet et al. 2016 ). Eckermann et al