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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2017, Vol. 14, No. 5, pp. 19-25

Modeling the passage of large-scale internal gravitational waves from the troposphere to the ionosphere

A.I. Suslov 1 , N.S. Erokhin 2, 1 , L.A. Mikhailovskaya 2 , S.N. Artekha 2 , A.A. Gusev 2 
1 Peoples' Friendship University of Russia, Moscow, Russia
2 Space Research Institute RAS, Moscow, Russia
Accepted: 08.07.2017
DOI: 10.21046/2070-7401-2017-14-5-19-25
On the basis of two-dimensional numerical computations of the trajectories of internal gravitational waves (IGW), propagation of IGW in a vertically non-uniform atmosphere from tropospheric heights to the ionosphere is considered in the presence of zonal flows with allowance for their height heterogeneity. In the troposphere, IGW can be excited with the development of such processes as large-scale vortices, earthquakes, etc. For series of data on the vertical profiles of the Väisälä-Brent frequency and the altitude profile of the velocity of the zonal flow in the atmosphere, an analysis is made for the possibility of passage of small- and medium-scale IGW from the troposphere to the ionosphere up to a height of more than 80 km. According to numerical calculations, depending on the IGW parameters and the zonal flow in the atmosphere, various variants of IGW propagation in a vertically inhomogeneous troposphere-ionosphere system are possible. In particular, a conclusion made earlier is confirmed that if there are critical layers or layers of vertical reflection in the atmosphere, the passage of IGW into the ionosphere is impossible. In the presence of a critical layer, IGW propagating to it from below greatly slows down, the vertical component of the wave vector increases strongly, and the IGW near the critical layer propagates almost horizontally. Moreover, due to the large increase in viscosity, it is actually completely absorbed at the height of the critical layer. Depending on the initial parameters of the system, there may be a situation when a layer of horizontal reflection appears at a certain height, and IGW is reflected (propagating upward) back to the source of its excitation. Then, a vertical reflection layer can appear above, and the wave, propagating downward from it, again approaches the horizontal reflection layer. After reflection in it, IGW returns to the source on the other side. According to the numerical calculations of the IGW dynamics, the horizontal displacement of the IGW packet during propagation from the troposphere to the ionosphere can be large (depending on the choice of the initial parameters of the problem, the altitude profiles of the zonal stream, the Väisälä-Brent frequency) and can be thousands of kilometers. Consequently, under the conditions of realization of the IGW passage from the troposphere to ionospheric heights, precursors of crisis events in the ionosphere (including plasma perturbations) can be observed by satellite equipment at large distances horizontally from the source of generation of IGW. This circumstance should be taken into account when analyzing and interpreting experimental data on the relationship between ionospheric disturbances and crisis phenomena, for example, earthquakes, tropical cyclones, etc.
Keywords: internal gravity waves, troposphere, Väisälä-Brent frequency, zonal flow, critical layer, precursors, ionosphere
Full text

References:

  1. Aburdzhania G.D., Samoorganizatsiya akustiko-gravitatsionnykh vikhrei v ionosfere pered zemletryaseniem (Self-organization of acoustic-gravitational vortices in the ionosphere before the earthquake), Fizika plazmy, 1996, Vol. 22, No. 10, pp. 954–959.
  2. Gossard E.E., Khuk U.K., Volny v atmosfere (Waves in the atmosphere), Moscow: Mir, 1978, 532 p.
  3. Erokhin N.S., Shalimov S.L., Ionosfernye effekty, initsiirovannye intensivnymi atmosfernymi vikhryami (Ionospheric effects initiated by intense atmospheric vortices), International Conference MSS-04 “Mode conversion, coherent structures and turbulenc”, Moscow: Rokhos, 2004, pp. 426–434.
  4. Erokhin N.S., Mikhailovskaya L.A., Shalimov S.L., Prokhozhdenie krupnomasshtabnykh vnutrennikh gravitatsionnykh voln cherez vetrovye struktury v nizhnei i srednei atmosfere na ionosfernye vysoty (Passage of large-scale internal gravity waves through wind structures in the lower and middle atmosphere to ionospheric heights), Geofizicheskie issledovaniya, 2007, Issue 7, pp. 53–64.
  5. Erokhin N.S., Nekrasov A.K., Shalimov S.L., Kollaps vnutrennikh gravitatsionnykh voln v dvumerno-neodnorodnoi atmosfere Ch. 1 (Collapse of internal gravitational waves in a two-dimensional inhomogeneous atmosphere Part 1), Geomagnetizm i aeronomiya, 1994, Vol. 34, No. 6, pp. 150–160.
  6. Ivanov Yu.A., Morozov E.G., Deformatsiya vnutrennikh gravitatsionnykh voln potokom s gorizontal’nym sdvigom skorosti (Deformation of internal gravity waves by a stream with a horizontal velocity shift), Okeanologiya, 1974, Vol. 14, No. 3, pp. 135–141.
  7. Liperovskii V.A., Pokhotelov O.A., Shalimov S.L., Ionosfernye predvestniki zemletryasenii (Ionospheric precursors of earthquakes), Moscow: Nauka, 1992, 304 p.
  8. Miropol’skii Yu.Z., Dinamika vnutrennikh gravitatsionnykh voln v okeane (Dynamics of internal gravitational waves in the ocean), Leningrad: Gidrometeoizdat, 1981, 302 p.
  9. Pertsev N.N., Shalimov S.L., Generatsiya atmosfernykh gravitatsionnykh voln v seismicheski aktivnom regione i ikh vliyanie na ionosferu (Generation of atmospheric gravity waves in a seismically active region and their influence on the ionosphere), Geomagnetizm i aeronomiya, 1996, Vol. 36, No. 2, pp. 111–118.
  10. Stepanyants Yu.A., Fabrikant A.L., Rasprostranenie voln v sdvigovykh gidrodinamicheskikh techeniyakh (Propagation of waves in shear hydrodynamic flows), Uspekhi fizicheskikh nauk, 1989, Vol. 159, Issue 1, pp. 83–123.
  11. Chernyi I.V., Chernyavskii G.M., Uspenskii A.B., Pegasov V.M., SVCh-radiometr MTVZA sputnika «Meteor-3M» No. 1: Predvaritel’nye rezul’taty letnykh ispytanii (Microwave radiometer MTVZA of the satellite “Meteor-3M” No. 1: Preliminary results of flight tests), Issledovanie Zemli iz kosmosa, 2003, No. 6, pp. 35–48.
  12. Buhler O., McIntyre M.E., On Shear-Generated Gravity Waves that Reach the Mesosphere. Part I: Wave Generation, J. Atmospheric Sciences, 1999, Vol. 56, pp. 3749–3763.
  13. Dhaka S.K., Murthy B.V.K., Nagpal O.P., Raghava Rao R., Sasi M.N., Sundaresan S., A study of equatorial waves in the Indian zone, J. Atmospheric and Solar-Terrestrial Physics, 1995, Vol. 57, No. 11, pp. 1189–1202.
  14. Kaladze T.D., Pokhotelov O.A., Shah H.A., Khan M.I., Stenflo L., Acoustic-gravity waves in the Earth’s ionosphere, J. Atmospheric and Solar-Terrestrial Physics, 2008, Vol. 70, pp. 1607–1616.
  15. Medvedev A.S., Gavrilov N.M., The nonlinear mechanism of gravity waves generation by meteorological motions in the atmosphere, J. Atmospheric and Solar-Terrestrial Physics, 1995, Vol. 57, No. 11, pp. 1221–1231.
  16. Turek R.S., Miller K.L., Roper R.G., Brosnahan J.W., Mesospheric wind studies during AIDA Act’89: morphology and comparison of various techniques, J. Atmospheric and Solar-Terrestrial Physics, 1995, Vol. 57, No. 11, pp. 1321–1344.