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Lunar Tidal Winds Measured in the Upper Atmosphere (78–105 km) at Saskatoon, Canada

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  • 1 High Alttitude Observatory, National Center for Atmospheric Research, Boulder, CO 80307
  • | 2 Institute of Space and Atmospheric Studies, University of Saskatchewan, Saskatoon, Canada
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Abstract

Six years of winds data measured by the partial reflection drifts technique have been analyzed for lunar tides. Data are available at 3 km intervals of height and are separately analyzed in two year datasets to cheek consistency. A month-by-month seasonal variation is derived. Largest amplitudes of the lunar tide occur in January–February with a smaller maximum in summer. The vertical wavelength is longest in summer, and the tide then resembles that predicted for a pure (2, 2) mode. In winter vertical wavelengths range from 25 to 81 km in different years. Several of these results do not agree with the model of Forbes. An O1 component of the lunar tide could not be detected.

Abstract

Six years of winds data measured by the partial reflection drifts technique have been analyzed for lunar tides. Data are available at 3 km intervals of height and are separately analyzed in two year datasets to cheek consistency. A month-by-month seasonal variation is derived. Largest amplitudes of the lunar tide occur in January–February with a smaller maximum in summer. The vertical wavelength is longest in summer, and the tide then resembles that predicted for a pure (2, 2) mode. In winter vertical wavelengths range from 25 to 81 km in different years. Several of these results do not agree with the model of Forbes. An O1 component of the lunar tide could not be detected.

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