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http://hdl.handle.net/20.500.12386/30892
Titolo: | Circulation of Venusian Atmosphere at 90-110 km Based on Apparent Motions of the O2 1.27 μm Nightglow From VIRTIS-M (Venus Express) Data | Autori: | Gorinov, D. A. Khatuntsev, I. V. Zasova, L. V. Turin, A. V. PICCIONI, GIUSEPPE |
Data pubblicazione: | 2018 | Rivista: | GEOPHYSICAL RESEARCH LETTERS | Numero: | 45 | Fascicolo: | 5 | Da pagina:: | 2554 | Abstract: | The paper is devoted to the investigation of Venus mesosphere circulation at 90-110 km altitudes, where tracking of the O<SUB>2</SUB>(a<SUP>1</SUP>∆<SUB>g</SUB>) 1.27 μm nightglow is practically the only method of studying the circulation. The images of the nightglow were obtained by VIRTIS-M on Venus Express over the course of more than 2 years. The resulting global mean velocity vector field covers the nightside between latitudes 75°S-20°N and local time 19-5 h. The main observed mode of circulation is two opposite flows from terminators to midnight; however, the wind speed in the eastward direction from the morning side exceeds the westward (evening) by 20-30 m/s, and the streams "meet" at 22.5 ± 0.5 h. The influence of underlying topography was suggested in some cases: Above mountain regions, flows behave as if they encounter an "obstacle" and "wrap around" highlands. Instances of circular motion were discovered, encompassing areas of 1,500-4,000 km. | URI: | http://hdl.handle.net/20.500.12386/30892 | URL: | https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1002/2017GL076380 | ISSN: | 0094-8276 | DOI: | 10.1002/2017GL076380 | Bibcode ADS: | 2018GeoRL..45.2554G | Fulltext: | open |
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