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Abstract
The Solar Backscatter UV ozone data collected for the eight years between 1979 and 1986 are used to analyze the signatures of equatorially trapped Kelvin waves in the upper stratosphere. The data reveal a strong semiannual modulation of Kelvin wave activity, confirming the results of previous rocketsonde observations. A comparison of the eight-year-average ensemble spectra to the semiannual oscillation in the stratospheric zonal winds revealed a seasonal asymmetry in the strength of Kelvin waves, which mimics the asymmetry observed in the zonal winds. No consistent relationship was observed with the quasi-biennial oscillation in the lower stratosphere, while correlations with the upper stratospheric winds are weak or nonexistent.
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