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Venus surface thermal emission at 1 μm in VIRTIS imaging observations: Evidence for variation of crust and mantle differentiation conditions

Müller, N. and Helbert, J. and Hashimoto, G.L. and Tsang, C.C.C. and Erard, S. and Piccioni, G. and Drossart, P. (2008) Venus surface thermal emission at 1 μm in VIRTIS imaging observations: Evidence for variation of crust and mantle differentiation conditions. Journal of Geophysical Research (113), E00B17. DOI: 10.1029/2008JE003118.

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Abstract

The Venus Express spacecraft images the nightside thermal emissions using the Visible and Infrared Thermal Imaging Spectrometer (VIRTIS). At 1.02, 1.10, and 1.18 μm, thermal emission from the surface is observed. The signal is attenuated by scattering and absorption in the dense atmosphere. The measured flux at the top of the atmosphere is positively correlated with surface temperature and surface emissivity. The surface temperature of Venus is relatively well constrained as being mainly a function of altitude with a gradient lesser or equal to the adiabatic lapse rate. This study examines the correlation of VIRTIS images showing a signal of the surface at 1.02 μm with viewing geometry, stray sunlight, cloud opacity, and topography and applies semiempirical relations to remove their influence. The remaining contrast can be either ascribed to surface emissivity or unexpected temperature variations. Temperature variations due to active volcanism are unlikely to be persistent over the time of observations; therefore, the mosaic of all processed images is here interpreted in terms of surface emissivity variation. The emissivity variation found is correlated with geomorphological features established from Magellan synthetic aperture radar images. It is generally lower at tessera terrain. Some, but not all, volcanic edifices show increased emissivity. Large lava flows in the Lada terra-Lavinia planitia region also show an increased thermal emission. This might indicate a more felsic surface composition of tessera highlands and large-scale extrusive volcanism of ultramafic composition.

Document Type:Article
Title:Venus surface thermal emission at 1 μm in VIRTIS imaging observations: Evidence for variation of crust and mantle differentiation conditions
Authors:
AuthorsInstitution or Email of Authors
Müller, N.UNSPECIFIED
Helbert, J.UNSPECIFIED
Hashimoto, G.L.Laboratory for Earth and Planetary Atmospheric Science, Department of Earth and Planetary Sciences, Kobe University, Kobe, Japan
Tsang, C.C.C.Atmospheric, Oceanic, and Planetary Physics, Department of Physics, Clarendon Laboratory, University of Oxford, Oxford, UK
Erard, S.LESIA, Observatoire de Paris, Paris, France
Piccioni, G.IASF-INAF, Rome, Italy
Drossart, P.LESIA, Observatoire de Paris, Paris, France
Date:December 2008
Journal or Publication Title:Journal of Geophysical Research
Refereed publication:Yes
In ISI Web of Science:Yes
DOI:10.1029/2008JE003118
Page Range:E00B17
Series Name:Planets
Status:Published
Keywords:Venus Express, VIRTIS, Visible and Infrared Thermal Imaging Spectrometer, temperature, emissivity, scattering, absorption, atmosphere, clouds, vulcanism, tessera highlands
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Vorhaben Venus Express Kamera (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Deposited By: Stefanie Hempel
Deposited On:15 Dec 2008
Last Modified:27 Apr 2009 15:36

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