Some results of S-transform analysis of the transient planetary-scale wind oscillations in the lower thermosphere

Yu I. Portnyagin, E. G. Merzlyakov, Ch Jacobi, N. J. Mitchell, H. G. Muller, A. H. Manson, W. Singer, P. Hoffmann, A. N. Fachrutdinova

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Abstract

Technique appropriate to the analysis of lower thermospheric wind data recorded by global-scale networks of ground-based instruments are discussed. The S-transform technique is shown to be effective in the analysis of the main features of travelling planetary waves and this method is applied to the time series of horizontal-velocity data obtained during the DYANA campaign (January-March, 1990). The analysis reveals strongly transient behavior of the day-to-day lower thermosphere wind variations, as well as their specific longitudinal structure. In particular, it was found that the revealed quasi-15 day and quasi-5 day wind oscillations may be described as transient westward-propagating waves with zonal wavenumber s = 1, while an oscillation with the a period near 7 days is tentatively identified as having a wavenumber s = 0.

Original languageEnglish
Pages (from-to)711-717
Number of pages7
JournalEarth, Planets and Space
Volume51
Issue number7-8
DOIs
Publication statusPublished - 26 Jun 2014

ASJC Scopus subject areas

  • Geology
  • Space and Planetary Science

Cite this

Portnyagin, Y. I., Merzlyakov, E. G., Jacobi, C., Mitchell, N. J., Muller, H. G., Manson, A. H., Singer, W., Hoffmann, P., & Fachrutdinova, A. N. (2014). Some results of S-transform analysis of the transient planetary-scale wind oscillations in the lower thermosphere. Earth, Planets and Space, 51(7-8), 711-717. https://doi.org/10.1186/BF03353229