Computer Science – Sound
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997adspr..19.1181z&link_type=abstract
Advances in Space Research, Volume 19, Issue 8, p. 1181-1190.
Computer Science
Sound
5
Scientific paper
The sounding geometry of Venera-15 allowed us to make measurements nearly along the meridian, and to obtain data practically simultaneously for a wide range of latitudes for almost the same local time. The results of detailed thermal wind field investigations, especially in the region of the mid-latitude jet, are presented. Vertical temperature profiles, retrieved from IR-spectra, are used to derive cyclostrophic zonal winds in the middle atmosphere of Venus (60-90 km, 30-70 degN). The thermal wind velocity field in altitude-latitude coordinates has been obtained for each observing session. The typical distance between two measured spectra, used for vertical temperature retrieval, is 2-4 degrees of latitude at middle and high latitudes. The mid-latitude cloud top jet was revealed at about 67-70 km in most sessions. Its latitude changes from 42 to 58 deg N and its central velocity varies from 150 to 90 m/s. The jet wind velocity obtained at the morning terminator is about 35 m/s higher than that at the evening one. On the morning side, we found a correlation between the velocity and the latitude of the jet, which keeps the angular momentum conserved. A connection between the jet velocity and the cold collar is observed. The mid-latitude jet is usually not found when the cold collar is absent. From the unique session for the Southern hemisphere a South midlatitude jet at about 70 km altitude has been observed at 45 deg S, having the central velocity of 100 m/s. In addition, a low latitude jet was revealed near 80 km altitude at 15 degS with a speed of 140 m/s. Fourier analysis of the jet velocity vs. solar longitude shows possible periods of about 60 days, 5.5 and 3.5 days. Two maxima of jet velocity have been obtained, at 9 AM (160 m/s) and 9 PM (130 m/s).
Khatountsev I. V.
Zasova Liudmila V.
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