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Volume 51 Supplement 7-8

Special Issue: Dynamics and Structure of the Mesopause Region (DYSMER)

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


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 westwardpropagating 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.


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Correspondence to Yu. I. Portnyagin.

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Portnyagin, Y.I., Merzlyakov, E.G., Jacobi, C. et al. Some results of S-transform analysis of the transient planetary-scale wind oscillations in the lower thermosphere. Earth Planet Sp 51, 711–717 (1999).

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