Abstract
Consider infrasonic atmospheric pressure variations, defined for our purposes to be in the period range from a few seconds to a few minutes. Such pressure fluctuations could come from nonpropagating pressure effects associated, for example, with the jet stream; such pressure variations are estimated. We shall be interested primarily in propagating pressure effects caused by atmospheric turbulence. Following standard aerosonic theory, which will be briefly reviewed, the intensity of low-frequency aerodynamic sound produced by upper atmosphere wind is estimated. The estimated power radiated by such aerodynamic sources is approximately that observed in noise measurements on the ground and in balloons. The infrasonic signals expected from large storms and from tornados will also be estimated and compared where possible with measurements. Certain characteristics of clear air turbulence could probably be sensed by arrays on the ground and this question will be briefly discussed. The possibility of sensing clear air turbulence in this way from moving aircraft will be examined.
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