Abstract

The physics of sonic boom propagation in the upper atmosphere is reviewed. Particular attention is given to the strengthening of the ascending wave due to decreasing density and to the formation of caustics near the turning point. Upward going sonic booms may be returned to the ground due to winds in the stratosphere or high temperatures in the thermosphere. The two cases are compared and contrasted. The possibility of measuring such booms at high altitudes using microphones, parachute deployed from small rockets, is discussed.

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