Venus wind regime in the lower mesosphere

Details Venus wind regime in the lower mesosphere Venus wind regime in the lower mesosphere

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007epsc.conf..599w&link_type=abstract

European Planetary Science Congress 2007, Proceedings of a conference held 20-24 August, 2007 in Potsdam, Germany. Online at ht

Physics

Scientific paper

An international campaign of wind measurements has been set up for ground observations of Venus in support of Venus Express between May 23 and June 9, 2007 during eastern (evening) elongation. Instruments aboard address the problem of mesospheric dynamics from extensive mapping of the temperature fields above the clouds from CO2 4.3- and 15-micrometers absorption (VIRTIS) and occultations (Spicav/SOIR). Winds at 70 km (and as well near 50 km) will be measured from cloud motion monitoring by both VIRTIS-M and VMC, and a qualitative description of the circulation at 95 - 110 km will be obtained from the morphology of the O2and CO2 emission mapped by VIRTIS. However, none of the previous experiments will be able to directly measure wind velocities above cloud level, which can be only performed from the ground. We measured the Doppler winds on the daylight hemisphere with OHP/1.93m/Sophie spectrograph between May 28 and June 1, 2007 (R = 75000, 0.38-0.69 micrometers), and CFHT/3.60m/ESPaDOnS high-resolution, fiber-fed spectrograph on July 2-3, 2007 (R = 80000, 0.37-1.05 micrometers). Lines in the visible (solar Fraunhofer lines and Venus atmospheric CO2 absorption lines) dynamically probe altitudes at or immediately above cloud tops (68-75 km) where zonal superrotating winds decrease but are also subject to intense, rapid temporal variations. I will present the first results of this international campaign of measurements above the clouds in the visible range.

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