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Stephen D. Eckermann, Dave Broutman, Jun Ma, James D. Doyle, Pierre-Dominique Pautet, Michael J. Taylor, Katrina Bossert, Bifford P. Williams, David C. Fritts, and Ronald B. Smith

MLT. The DA system continued to assimilate its regular extensive suite of archived operationally available observations spanning the 0–50-km-altitude range. Among these were the AVAPS dropsonde data that, after rapid postprocessing in Christchurch, were transmitted on WMO’s Global Telecommunication System (GTS) for access by operational centers. From 50 to 100 km, the system assimilated the following additional observations: temperature-sensitive microwave radiances from the upper

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Ronald B. Smith, Alison D. Nugent, Christopher G. Kruse, David C. Fritts, James D. Doyle, Steven D. Eckermann, Michael J. Taylor, Andreas Dörnbrack, M. Uddstrom, William Cooper, Pavel Romashkin, Jorgen Jensen, and Stuart Beaton

most active wave season and region in the world, zonally averaged MFs estimates at z = 20-km range from 2 to 18 mPa. While satellites, superpressure balloons, and radiosondes provide better spatial and temporal coverage of gravity waves, the most detailed wave observations come from aircraft transects through wave fields, capturing the full spectrum. Physical studies of wave generation and propagation require these targeted high-resolution observations. Furthermore, airborne wave detection has

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