Hydrodynamic α-effect in a rotating stratified moist atmosphere driven by small-scale non-helical force

M. I. Kopp , A. V. Tur (1) , V. V. Yanovsky

1 IRAP - Institut de recherche en astrophysique et planétologie

In this paper we have studied the large-scale instability in a rotating stratified moist atmosphere with a small-scale turbulence. The axis of rotation of the medium is deviated from the vertical direction. The turbulence is excited by an external small-scale force with zero helicity and a low Reynolds number. The nonlinear equations of a vortex dynamo were obtained on the basis of the method of multiscale asymptotic expansions. The linear instability and stationary nonlinear modes were studied. The solutions in a form of localized vortex structures were obtained.

Domaines: Planète et Univers [physics]

M. I. Kopp, A. V. Tur, V. V. Yanovsky. Hydrodynamic α-effect in a rotating stratified moist atmosphere driven by small-scale non-helical force. Geophysical & Astrophysical Fluid Dynamics, 2021, 115, pp.551-576. ⟨10.1080/03091929.2021.1946802⟩. ⟨insu-03672358⟩