Venus DopplerWinds at Cloud Tops Observed with ESPaDOnS at CFHT

Details Venus DopplerWinds at Cloud Tops Observed with ESPaDOnS at CFHT Venus DopplerWinds at Cloud Tops Observed with ESPaDOnS at CFHT

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf..561w&link_type=abstract

European Planetary Science Congress 2008, Proceedings of the conference held 21-25 September, 2008 in Münster, Germany. Online a

Physics

Scientific paper

In the lower mesosphere of Venus (65-85 km), visible observations of Doppler shifts in solar Fraunhofer lines, have provided the only direct Doppler wind measurements near the cloud tops in recent years [1]. The region is important as it constrains the global mesospheric circulation in which zonal winds generally decrease with height while thermospheric SS-AS winds increase. Renewed interest in measuring the winds at clouds top from the ground has emerged in the course of the Venus Express mission as well as recent reanalysis of Galileo NIMS near-infrared observations and SSI images [2], [3]. On Venus-Express, atmospheric circulation at 70 km (and as well near 50 km) is being measured from cloud tracking by both VIRTIS-M and VMC [4], [5].The main purpose of our work is therefore to provide direct wind measurements using visible Fraunhofer lines scattered by Venus cloud tops.

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