Gravity waves of short period /5-90 min/, in the lower thermosphere at 52 N /Saskatoon, Canada/

Details Gravity waves of short period /5-90 min/, in the lower thermosphere at 52 N /Saskatoon, Canada/ Gravity waves of short period /5-90 min/, in the lower thermosphere at 52 N /Saskatoon, Canada/

Feb 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jatp...42..103m&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 42, Feb. 1980, p. 103-113. Research supported by the National Research Cou

Computer Science

Sound

1

Gravity Waves, Thermosphere, Wave Reflection, Wind (Meteorology), Autocorrelation, Canada, Energy Dissipation, Polarization (Waves), Radio Waves, Sounding, Summer, Time Series Analysis, Wind Velocity, Winter

Scientific paper

Winds data from a partial reflection D1 drifts system are obtained from two 2-3 h soundings during summer and winter months. Sampling at 1 min intervals allows the resolution of frequencies as high as the Vaisala-Brunt frequency (tau approximately equal to 5 min), and on both occasions wind oscillations with periods from approximately 5 to 90 min were observed. Selected time series and spectra of east-west and north-south winds within the lower thermosphere are used to identify these oscillations as gravity waves. Polarization of the waves is present during both soundings. The autocorrelation functions of the reflected radiowaves (amplitude) are used to calculate a turbulent velocity parameter, and also the related rate of energy dissipation from approximately 70-100 km. The resulting energy dissipation profiles, with maximum values of about 0.05 W per kg near 90 , are compared with those obtained from the r.m.s. deviations of the winds.

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