Search Publications
Sulfur dioxide in the Venus atmosphere: I. Vertical distribution and variability
Vandaele, A. C.; Robert, S.; Montmessin, F. +18 more
Recent observations of sulfur containing species (SO2, SO, OCS, and H2SO4) in Venus' mesosphere have generated controversy and great interest in the scientific community. These observations revealed unexpected spatial patterns and spatial/temporal variability that have not been satisfactorily explained by models. S…
Sulfur dioxide in the Venus Atmosphere: II. Spatial and temporal variability
Vandaele, A. C.; Robert, S.; Montmessin, F. +18 more
The vertical distribution of sulfur species in the Venus atmosphere has been investigated and discussed in Part I of this series of papers dealing with the variability of SO2 on Venus. In this second part, we focus our attention on the spatial (horizontal) and temporal variability exhibited by SO2. Appropriate data sets - SPI…
Thermal structure of the upper atmosphere of Venus simulated by a ground-to-thermosphere GCM
López-Valverde, M. A.; Gilli, G.; González-Galindo, F. +5 more
We present here the thermal structure of the upper atmosphere of Venus predicted by a full self-consistent Venus General Circulation Model (VGCM) developed at Laboratoire de Météorologie Dynamique (LMD) and extended up to the thermosphere of the planet. Physical and photochemical processes relevant at those altitudes, plus a non-orographic GW para…
The thermal structure of the Venus atmosphere: Intercomparison of Venus Express and ground based observations of vertical temperature and density profiles✰
Montmessin, Franck; Tanga, Paolo; Tellmann, Silvia +30 more
The Venus International Reference Atmosphere (VIRA) model contains tabulated values of temperature and number densities obtained by the experiments on the Venera entry probes, Pioneer Venus Orbiter and multi-probe missions in the 1980s. The instruments on the recent Venus Express orbiter mission generated a significant amount of new observational …
Venus cloud-tracked and doppler velocimetry winds from CFHT/ESPaDOnS and Venus Express/VIRTIS in April 2014
Widemann, Thomas; Donati, Jean-François; Machado, Pedro +3 more
We present new coordinated observations and measurements of the wind amplitude and its variability at Venus cloud-tops based on the two complementary techniques of Ground-based Doppler velocimetry (Widemann et al., 2007, 2008; Machado et al., 2012, 2014) and cloud-tracked winds using ESA Venus Express/ VIRTIS-M imaging at 0.38 µm (Drossart e…
Analysis and modeling of remote observations of the martian hydrogen exosphere
Bertaux, J. -L.; Chaufray, J. -Y.; Clarke, J. T. +2 more
Past observations of the martian exosphere have given a wide range of values for the mean temperature and number density of the hydrogen population that occupies this uppermost layer. More recently, observations by HST and MEX have found large variations over short timescales exhibited by this layer, which have been attributed to seasonal effects.…
Overview of useful spectral regions for Venus: An update to encourage observations complementary to the Akatsuki mission
Sánchez-Lavega, A.; Widemann, T.; Imamura, T. +5 more
New tables to observe the planet Venus are presented with detailed information about the main spectral regions from 100 nm to 1 mm. The information hereby is updated thanks to the Venus Express legacy and recent ground-based observations, and we hope it can constitute a helpful tool for professional and amateur observers willing to support and coo…
Night side distribution of SO2 content in Venus' upper mesosphere
Montmessin, F.; Bertaux, J. -L.; Fedorova, A. A. +6 more
In this paper we present the first night side distribution of SO2 content in Venus' upper mesosphere (altitudes from 85 to 105 km). The dataset is based on the SPICAV UV stellar occultation experiment which took place onboard ESA's Venus Express (VEX) orbiter in 2006-2014. The UV channel of SPICAV spectrometer detected absorption bands …
Dawn-dusk difference of periodic oxygen EUV dayglow variations at Venus observed by Hisaki
Leblanc, François; Tsuchiya, Fuminori; Seki, Kanako +8 more
We report a dawn-dusk difference of periodic variations of oxygen EUV dayglow (OII 83.4 nm, OI 130.4 nm and OI 135.6 nm) in the upper atmosphere of Venus observed by the Hisaki spacecraft in 2015. Observations show that the periodic dayglow variations are mainly controlled by the solar EUV flux. Additionally, we observed characteristic ∼1 day and …
Radiative energy balance of Venus: An approach to parameterize thermal cooling and solar heating rates
Kappel, D.; Arnold, G.; Haus, R.
Thermal cooling rates QC and solar heating rates QH in the atmosphere of Venus at altitudes between 0 and 100 km are investigated using the radiative transfer and radiative balance simulation techniques described by Haus et al. (2015b, 2016). QC strongly responds to temperature profile and cloud parameter changes, …