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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/31210
Title: Global maps of Venus nightside mean infrared thermal emissions obtained by VIRTIS on Venus Express
Authors: Cardesín-Moinelo, A.
PICCIONI, GIUSEPPE 
MIGLIORINI, Alessandra 
GRASSI, Davide 
Cottini, V.
Titov, D.
POLITI, ROMOLO 
Nuccilli, F.
Drossart, P.
Issue Date: 2020
Journal: ICARUS 
Number: 343
Abstract: One of the striking features about Venus atmosphere is its temporal variability and dynamics, with a chaotic polar vortex, large-scale atmospheric waves, sheared features and variable winds that depend on local time and possibly orographic features. The aim of this research is to combine data accumulated over several years and obtain a global mean state of the atmosphere focusing in the global structure of the clouds using the cloud opacity and upper cloud temperatures. <P />We have first produced global maps using the integrated radiance through the infrared atmospheric windows centred around 1.74 μm and 2.25 μm, that show the spatial variations of the cloud opacity in the lower clouds around 44-48 km altitude and also provide an indirect estimation of the possible particle size. We have also produced similar global maps using the brightness temperatures seen in the thermal region at 3.8 μm and 5.0 μm, which provide direct indication of the temperatures at the top of the clouds around 60-70 km altitude. <P />These maps have been generated using the complete dataset of the Visible and InfraRed Thermal Imaging Spectrometer mapping channel (VIRTIS-M) on board Venus Express, with a wide spatial and long temporal coverage in the period from May 2006 until October 2008. <P />Our results provide a global view of the cloud opacity, particle size and upper cloud temperatures at both hemispheres, showing the main different dynamical regions of the planet. The profiles obtained also provide the detailed dependencies with latitude, local time and longitude, diagnostic of the global circulation flow and dynamics at various altitude layers, from about 44 up to 70 km over the surface.
URI: http://hdl.handle.net/20.500.12386/31210
URL: https://www.sciencedirect.com/science/article/pii/S0019103520300749?via%3Dihub
ISSN: 0019-1035
DOI: 10.1016/j.icarus.2020.113683
Bibcode ADS: 2020Icar..34313683C
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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