Abstract
The concept of dynamic instability appeared along with the initial developments in the theory of atmospheric disturbances [2]. In the method of perturbations, which V. Bjerknes introduced into meteorology, a “small motion” is superimposed on a state of “simple motion” of the air. This “simple motion” is always a permanent motion characterized, at every point of the medium, by equilibrium of the forces perpendicular to the direction of the flow. These forces are gravity, the pressure gradient (hydrostatic equilibrium), the Coriolis force (state of geostrophic motion), and the centrifugal force (circular vortex). The “simple motion,” therefore, is evidently a state of hydrodynamic equilibrium.
Translated from the original French.
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van Mieghem, J.M. (1951). Hydrodynamic Instability. In: Malone, T.F. (eds) Compendium of Meteorology. American Meteorological Society, Boston, MA. https://doi.org/10.1007/978-1-940033-70-9_37
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DOI: https://doi.org/10.1007/978-1-940033-70-9_37
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