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Whitepaper #139 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: basic research. Additional topics: planetary ionospheres / upper atmospheres; space-based missions/projects; system science.
A major advance in global mesosphere and lower thermosphere (MLT) wind and temperature observation is ready to be demonstrated from LEO using an instrument named DWTS (Doppler Wind and Temperature Sounder). This white paper describes the DWTS concept, a soon to be launched pathfinder instrument and the goal of observing global MLT winds and temperatures using a constellation of DWTS CubeSats.