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Sept. 28, 2012; Combo probe mounted on the nose of the unmanned aerial vehicle (UAV) at the U.S. Army Dugway Proving Ground in Utah. The device is a combination of an ultrasonic anemometer (the larger piece with the ears) and hot film anemometers (barely visible with the red tips). This instrument allows the measurement of the energy dissipated by the atmosphere. Photo by Barbara Johnston/University of Notre Dame
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