Measurements of the diurnal tides in the 80- to 100-km altitude range at Arecibo

Details Measurements of the diurnal tides in the 80- to 100-km altitude range at Arecibo Measurements of the diurnal tides in the 80- to 100-km altitude range at Arecibo

Sep 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.4671m&link_type=abstract

Journal of Geophysical Research, vol. 81, Sept. 1, 1976, p. 4671-4677. NSF-supported research.

Computer Science

Sound

6

Atmospheric Tides, D Region, Diurnal Variations, Incoherent Scattering, Ionospheric Sounding, Wind Measurement, Night Sky, Phase Velocity, Propagation Modes, Radar Scattering, Root-Mean-Square Errors, Wind Shear

Scientific paper

The incoherent scatter radar at Arecibo has been used to measure the 80-100 km wind system on two November and two April days. The wind system is shown to correspond most closely to the S1,1 mode diurnal tide. Dissipation effects were always important, and in the April data the tide was seen to 'break' at an altitude of 92 km and an amplitude of 60 m/s. The observed vertical wavelength was equal to 19.5 km; a Richardson number of 0.2, a 40 K temperature oscillation, and an upward energy flux of 0.00042 W per sq m were inferred.

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