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Science objectives and performances of NOMAD, a spectrometer suite for the ExoMars TGO mission
Aoki, S.; Vandaele, A. C.; Daerden, F. +49 more
The NOMAD spectrometer suite on the ExoMars Trace Gas Orbiter will map the composition and distribution of Mars' atmospheric trace species in unprecedented detail, fulfilling many of the scientific objectives of the joint ESA-Roscosmos ExoMars Trace Gas Orbiter mission. The instrument is a combination of three channels, covering a spectral range f…
Radiative heating and cooling in the middle and lower atmosphere of Venus and responses to atmospheric and spectroscopic parameter variations
Kappel, D.; Arnold, G.; Haus, R.
A sophisticated radiative transfer model that considers absorption, emission, and multiple scattering by gaseous and particulate constituents over the broad spectral range 0.125-1000 µm is applied to calculate radiative fluxes and temperature change rates in the middle and lower atmosphere of Venus (0-100 km). Responses of these quantities t…
Six years of Venus winds at the upper cloud level from UV, visible and near infrared observations from VIRTIS on Venus Express
Hueso, R.; Sánchez-Lavega, A.; Peralta, J. +2 more
The Venus Express mission has provided a long-term monitoring of Venus atmosphere including the morphology and motions of its upper clouds. Several works have focused on the dynamics of the upper cloud visible on the day-side in ultraviolet images sensitive to the 65-70 km altitude and in the lower cloud level (50 km height) observable in the nigh…
Update of the Venus density and temperature profiles at high altitude measured by SOIR on board Venus Express
Pätzold, M.; Vandaele, A. C.; Robert, S. +10 more
The SOIR instrument on board Venus Express regularly sounds the Venus atmosphere using the solar occultation technique. The density and temperature profiles are inferred from SOIR spectra recorded in the infrared. The method has been described in a previous publication (Mahieux et al., 2012. J. Geophys. Res. 117. doi:10.1029/2012JE004058.). This p…
Thermal structure of Venus nightside upper atmosphere measured by stellar occultations with SPICAV/Venus Express
Vandaele, A. C.; Montmessin, F.; Fedorova, A. +7 more
The thermal structure of Venus upper atmosphere (90-140 km) was investigated using stellar occultation measurements acquired by the SPICAV experiment on board Venus Express. The SPICAV ultraviolet channel provides CO2 local density and temperature vertical profiles with a vertical resolution of < 7 km of both the southern and the nor…
A new, fast and flexible radiative transfer method for Venus general circulation models
Wilson, C. F.; Read, P. L.; Lee, C. +1 more
We present a new radiation scheme for the Oxford Planetary Unified Model System for Venus, suitable for the solar and thermal bands. This new and fast radiative parameterization uses a different approach in the two main radiative wavelength bands: solar radiation (0.1 - 5.5 µm) and thermal radiation (1.7 - 260 µm). The solar radiation …
Comparative pick-up ion distributions at Mars and Venus: Consequences for atmospheric deposition and escape
Luhmann, Janet; Curry, Shannon M.; Hara, Takuya +3 more
Without the shielding of a substantial intrinsic dipole magnetic field, the atmospheres of Mars and Venus are particularly susceptible to similar atmospheric ion energization and scavenging processes. However, each planet has different attributes and external conditions controlling its high altitude planetary ion spatial and energy distributions. …
Submillimeter mapping of mesospheric minor species on Venus with ALMA
Lellouch, E.; Encrenaz, T.; Moreno, R. +2 more
Millimeter and submillimeter heterodyne spectroscopy offers the possibility of probing the mesosphere of Venus and monitoring minor species and winds. ALMA presents a unique opportunity to map mesospheric species of Venus. During Cycle 0, we have observed Venus on November 14 and 15, 2011, using the compact configuration of ALMA. The diameter of V…
Explosive volcanic activity on Venus: The roles of volatile contribution, degassing, and external environment
Wilson, C. F.; Glaze, L. S.; Airey, M. W. +3 more
We investigate the conditions that will promote explosive volcanic activity on Venus. Conduit processes were simulated using a steady-state, isothermal, homogeneous flow model in tandem with a degassing model. The response of exit pressure, exit velocity, and degree of volatile exsolution was explored over a range of volatile concentrations (H
Photochemical control of the distribution of Venusian water
Gao, Peter; Parkinson, Christopher D.; Esposito, Larry +3 more
We use the JPL/Caltech 1-D photochemical model to solve continuity diffusion equation for atmospheric constituent abundances and total number density as a function of radial distance from the planet Venus. Photochemistry of the Venus atmosphere from 58 to 112 km is modeled using an updated and expanded chemical scheme (Zhang et al., 2010, 2012), g…