Gravity waves in the equatorial mesosphere

Details Gravity waves in the equatorial mesosphere Gravity waves in the equatorial mesosphere

Jan 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jatp...38...51r&link_type=abstract

(Union Radio Scientifique Internationale, General Assembly, 18th, Lima, Peru, August 8-19, 1975.) Journal of Atmospheric and Ter

Computer Science

Sound

6

Atmospheric Circulation, Gravity Waves, Mesosphere, Tropical Regions, Wavelengths, Ion Acoustic Waves, Oscillographs, Power Spectra, Propagation Velocity, Sound Waves, Wave Packets

Scientific paper

Oscillations observed in the mesospheric velocities measured at Jicamarca, Peru, are interpreted to be a manifestation of atmospheric gravity waves with periods of less than 4 min to more than 1 hr. The waves with periods exceeding 1 hr have amplitudes weaker than those predicted by tidal theory. Acoustic gravity waves with periods of less than 4 min are usually weakly present, but on one occasion, a well-defined wave packet was observed. The dominant waves have a period of about 10 to 20 min. It is shown that the measurements are not sufficient by themselves to provide an independent estimate of wavelengths of the dominant waves. Using the theoretical dispersion and polarization relations for atmospheric gravity waves, it is shown that the observed waves are vertically evanescent and have horizontal wavelengths of 200 to 300 km at periods of about 15 min.

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