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Venus surface data extraction from VIRTIS/VEX measurements

Arnold, Gabriele and Haus, Rainer and Döhler, Wolfgang and Kappel, David and Drossart, Pierre and Piccioni, Guiseppe and VIRTIS/VEX Team, (2008) Venus surface data extraction from VIRTIS/VEX measurements. In: 40th annual meeting of the Division for Planetary Sciences (DPS meeting #40, #62.04) (40), p. 512. 40th annual meeting of the Division for Planetary Sciences (DPS) of the American Astronomical Society, 2008-10-10 - 2008-10-15, Ithaca, NY.

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Abstract

The capability of near infrared nightside thermal emission measurements by the Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) on Venus Express (VEX) was used to extract surface properties in the northern hemisphere of Venus. The study includes VIRTIS topographic footprint variations from – 2000 m to 6000 m in height. Preliminary radiative transfer calculation techniques were applied to simulate Venus nightside radiation with respect to the cloud opacity and surface elevation. The results were compared to the VIRTIS measurements. Below 1.5 µm conservative scattering is dominating the cloud feature, Therefore, radiance ratios in the 1.0-1.35 µm spectral windows can be used to eliminate cloud interferences. It is shown that the radiance ratios of the 1.10, 1.18, 1.28, and 1.31 µm windows with respect to the radiance in the 1.02 µm window are independent on the cloud influence. At constant cloud opacity the simulations at 1.02, 1.10, and 1.18 µm show a clear dependence of the transmitted nightside radiation on topography. An elevation change of 12 km results in a surface temperature change of 100 K. The measured and simulated window radiance ratios are in excellent agreement. The correlation between the ratios of the surface window radiances and elevations was used to retrieve the surface topography and temperatures near Beta region. VIRTIS and Magellan topographies are largely in agreement to each other but differences are obtained in certain small areas. They will be of special interest for the future separation of surface temperature, emissivity and deep atmosphere dynamic phenomena.

Document Type:Conference or Workshop Item (Speech)
Title:Venus surface data extraction from VIRTIS/VEX measurements
Authors:
AuthorsInstitution or Email of Authors
Arnold, GabrieleWestfälische Wilhelms-Universität Münster
Haus, RainerUNSPECIFIED
Döhler, WolfgangUNSPECIFIED
Kappel, DavidUNSPECIFIED
Drossart, PierreLESIA, Observatoire de Paris, France
Piccioni, GuiseppeINAF-IASF, Italy
VIRTIS/VEX Team, UNSPECIFIED
Date:October 2008
Journal or Publication Title:40th annual meeting of the Division for Planetary Sciences (DPS meeting #40, #62.04)
Page Range:p. 512
Editors:
EditorsEmail
American Astronomical Society, UNSPECIFIED
Series Name:Bulletin of the American Astronomical Society
Status:Published
Keywords:VIRTIS, VEX, Venus
Event Title:40th annual meeting of the Division for Planetary Sciences (DPS) of the American Astronomical Society
Event Location:Ithaca, NY
Event Type:international Conference
Event Dates:2008-10-10 - 2008-10-15
Organizer:American Astronomical Society
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Entwicklung und Erprobung von Verfahren zur Gewässerfernerkundung (old)
Location: Berlin-Adlershof
Institutes and Institutions:Remote Sensing Technology Institute > Marine Remote Sensing
Deposited By: Bärbel Bolowski
Deposited On:23 Apr 2009
Last Modified:27 Apr 2009 15:11

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