Mathematics
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jats...44.2628y&link_type=abstract
Journal of the Atmospheric Sciences (ISSN 0022-4928), vol. 44, Sept. 15, 1987, p. 2628-2639. Research supported by the Aerospace
Mathematics
26
Atmospheric Circulation, Gravity Waves, Topography, Venus Surface, Balloon Flight, Mathematical Models, Orography, Vega Project, Wave Amplification, Venus, Gravity Waves, Surface, Topography, Comparisons, Vega Missions, Spacecraft Observations, Balloons, Probes, Atmosphere, Altitude, Wind, Clouds, Density, Amplification, Resonance, Aphrodite Terra, Amplitude, Stability, Models, Parameters, Calculations, Pvo Mission
Scientific paper
Data from the 1985 VEGA Venus Balloon Mission indicate that the mountainous region known as Aphrodite influences atmospheric motions at balloon float altitudes near 54 km, an altitude located within the middle cloud region. It is shown that stationary gravity waves, generated by surface topography and Doppler-shifted by a wind blowing over the terrain, can propagate upward to the middle cloud layers. Under the right circumstances, waves are amplified considerably in excess of their amplification due to the decrease of density with altitude. The additional amplification is due to resonance that results from variations of static stability and mean zonal wind with altitude. Computed atmospheric propagation characteristics, combined with terrain slopes in Aphrodite estimated from Pioneer Venus radar altimeter data, can be sufficient to produce wind amplitudes at 54 km comparable to those observed by the VEGA-2 balloon as it overflew Aphrodite. The dominant waves have horizontal wavelengths of the order of several hundred kilometers.
Linkin V. M.
Lipatov A. N.
Schubert Gerald
Seiff Alvin
Walterscheid Richard L.
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