Abstract
We consider atmospheric pressure variations in the period range from a few seconds to a few minutes. These pressure fluctuations arise 1. (a) from local hydrodynamic effects which are estimated; 2. (b) from nonpropagating pressure effects associated, for example, with a jet stream; 3. (c) from propagating pressure effects associated with aerodynamic infrasound. Following standard aerosonic theory, which is briefly reviewed here, the intensity of aerodynamic sound is estimated. The estimated amount of power radiated by aerodynamic sources, chiefly fluctuating winds at high altitude, is approximately that observed in noise measurements on the ground. Comparison is made between these theoretical estimates and observed pressure fluctuations in the low frequency range.
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