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HDO and SO₂ thermal mapping on Venus. III. Short-term and long-term variations between 2012 and 2016

Encrenaz, T.; Atreya, S. K.; Bézard, B. +6 more

We present the analysis of a four-year observational campaign using the TEXES high-resolution imaging spectrometer at the NASA Infrared Telescope Facility to map sulfur dioxide and deuterated water over the disk of Venus. Data have been recorded in two spectral ranges around 1345 cm^-1 (7.4 µm) and 530 cm^-1 (19 µm)…

Dayside temperatures in the Venus upper atmosphere from Venus Express/VIRTIS nadir measurements at 4.3 µm

López-Valverde, M. A.; Gilli, G.; Peralta, J. +1 more

In this work, we analysed nadir observations of atmospheric infrared emissions carried out by VIRTIS, a high-resolution spectrometer on board the European spacecraft Venus Express. We focused on the ro-vibrational band of CO₂ at 4.3 µm on the dayside, whose fluorescence originates in the Venus upper mesosphere and above. This is t…

Multilayer modeling of the aureole photometry during the Venus transit: comparison between SDO/HMI and VEx/SOIR data

Vandaele, A. C.; Wilquet, V.; Mahieux, A. +4 more

Context. The mesosphere of Venus is a critical range of altitudes in which complex temperature variability has been extensively studied by the space mission Venus Express (VEx) during its eight-year mission (2006-2014). In particular, the Solar Occultation in the InfraRed (SOIR) instrument probed the morning and evening terminator in the 70-170 km…