On the instability of internal gravity waves propagating at small but finite angles to the verticalстатья
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Дата последнего поиска статьи во внешних источниках: 11 апреля 2019 г.
Аннотация:The question of the instability of internal gravity waves (IGWs) propagating
at small angles to the vertical is re-visited. The case of an
IGW of finite-amplitude propagating at a very small but finite angle
to the vertical is considered. This angle serves as a small parameter
in the problem, and the instability of such an IGW is investigated by
using the Fourier method and the Sivashinsky integral relations. The
analysis undertaken confirms the existence of short-wave instability
for small IGW amplitudes and for an arbitrarily small value of their
propagation angle to the vertical. For small viscosity and thermal
conductivity of the fluid medium, the growth rate of the most unstable
mode is proportional to the square of the amplitude of the IGW.
The results obtained may be of interest for interpreting the results
of observations and confirming the existence of turbulence in the
middle atmosphere.