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Generation Model of a Spatially Limited Vortex in a Stratified Unstable Atmosphere

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Abstract

This paper presents a new model for the generation of axisymmetric concentrated vortices. The solution of a nonlinear equation for internal gravity waves in an unstable stratified atmosphere is obtained and analyzed within the framework of ideal hydrodynamics. The corresponding expressions describing the dependences on the radius for the radial and vertical velocity components in the inner and outer regions of the vortex include combinations of Bessel functions and modified Bessel functions. The proposed new nonlinear analytical model makes it possible to study the structure and nonlinear dynamics of vortices in the radial and vertical regions. The vortex is limited in height. The maximum vertical velocity component is reached at a certain height. Below this height, radial flows converge towards the axis, and above it, an outflow occurs. The resulting instability in the stratified atmosphere leads to an increase in the radial and vertical velocity components according to the hyperbolic sine law, which turns into exponential growth. The characteristic growth time is determined by the inverse growth rate of the instability. The formation of vortices with finite velocity components, which increase with time, is analyzed. The radial structure of the azimuthal velocity is determined by the structure of the initial perturbation and can change with height. The maximum rotation is reached at a certain height. The growth of the azimuth velocity occurs according to a super-exponential law.

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Funding

The work was supported by the State task of the Institute of Physics of the Earth Russian Academy of Sciences and the state task on the “Monitoring” subject of fundamental scientific research of IKI RAS (122042500031-8).

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Authors and Affiliations

  1. Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, 123995, Moscow, Russia

    O. G. Onishchenko & F. Z. Feygin

  2. Space Research Institute, Russian Academy of Sciences, 117997, Moscow, Russia

    O. G. Onishchenko, S. N. Artekha & N. M. Astafieva

Authors
  1. O. G. Onishchenko
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  2. S. N. Artekha
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  3. F. Z. Feygin
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  4. N. M. Astafieva
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Correspondence to O. G. Onishchenko, S. N. Artekha, F. Z. Feygin or N. M. Astafieva.

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Onishchenko, O.G., Artekha, S.N., Feygin, F.Z. et al. Generation Model of a Spatially Limited Vortex in a Stratified Unstable Atmosphere. Geomagn. Aeron. 63, 464–472 (2023). https://doi.org/10.1134/S0016793223600340

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  • DOI: https://doi.org/10.1134/S0016793223600340

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