A study of the vertical motion field near the high-latitude summer mesopause during MAC/SINE

Physics

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Eiscat Radar System (Europe), Gravity Waves, Mesopause, Polar Regions, Wind Velocity, Frequency Distribution, Norway, Summer, Velocity Distribution, Vertical Distribution, Very High Frequencies

Scientific paper

The EISCAT and SOUSY VHF radars obtained high-resolution observations of the vertical velocity field near the high-latitude summer mesopause in northern Norway in 1987. An energetic field is detected whose motions exhibit a high degree of vertical coherence and a quasi-periodic structure. Frequency spectra computed for each radar are found to exhibit substantial variability, while vertical wavenumber spectra are noted to be variable in amplitude and to possess slopes approaching -3 at lower wavenumbers. These results suggest an energetic spectrum of gravity wave motions near the mesopause which has a large vertical flux of wave energy.

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