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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/angeo-2019-1
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2019-1
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 21 Jan 2019

Regular paper | 21 Jan 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Annales Geophysicae (ANGEO).

Evanescent acoustic-gravity modes in the isothermal atmosphere: systematization, applications to the earth's and solar atmospheres

Oleg K. Cheremnykh, Alla K. Fedorenko, Evgen I. Kryuchkov, and Yuriy A. Selivanov Oleg K. Cheremnykh et al.
  • Space Research Institute NASU-SSAU, Kyiv, 03187, Ukraine

Abstract. The objects of research in this work are evanescent wave modes in a gravitationally stratified atmosphere and their associated pseudo-modes. Whereas the former, according to the dispersion relation, rapidly decrease with distance from a certain surface, the latter, having the same dispersion law, differ from the first by the form of polarization and the character of its decreasing away from the surface. Within a linear hydrodynamic model, the propagation features of evanescent wave modes in an isothermal atmosphere are studied. Research carried out for different assumptions about the properties of the medium. On this way, a new wave mode – anelastic evanescent wave mode – was discovered. Also, the possibility of the existence of a pseudo-mode related to it is indicated. The case of two isothermal media differing in temperature at the interface is studied in detail. It is shown that a non-divergent pseudo-mode with the dispersion of solar f-mode type can be realized on the interface for the specified horizontal scale. The newly discovered dispersion relation, at the interface of two media, is satisfied by the wave mode, which has different types of amplitude versus height dependencies at different horizontal scales. The applicability of the obtained results to clarify the properties of f-mode observed on the Sun is analyzed.

Oleg K. Cheremnykh et al.
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Oleg K. Cheremnykh et al.
Oleg K. Cheremnykh et al.
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Latest update: 21 Apr 2019
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Short summary
The fundamental mode of oscillations of the solar atmosphere, f-mode, plays an important role in solar physics. At an early stage of observing, it was found that its frequency is related to the wavelength by a ratio characteristic of waves on the surface of deep water. Subsequent observations revealed its inaccuracy. We derived waves with a different frequency-wavelength ratio and compared them with other possible waves of this type both in the solar and in the terrestrial atmosphere.
The fundamental mode of oscillations of the solar atmosphere, f-mode, plays an important role in...
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