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Atmospheric correction for VIRTIS VEX images of surface thermal emissions

Müller, N. und Helbert, J. und Erard, S. und Piccioni, G. und Drossart, P. und VIRTIS VEX-Team, (2008) Atmospheric correction for VIRTIS VEX images of surface thermal emissions. European Geosciences Union - General Assembly, 2008-04-13 - 2008-04-18, Vienna (Austria).

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Offizielle URL: http://www.cosis.net/abstracts/EGU2008/09814/EGU2008-A-09814.pdf

Kurzfassung

Spectral window regions close to 1 micron allow for the transfer of thermal radiation from the surface through the atmosphere of Venus. Results of radiative transfer modeling are used to invert VIRTIS images at 1.02 micron for thermal emission of the surface. Local atmospheric transmittance is derived from the VIRTIS band at 1.31 micron. Statistical analysis of VIRTIS Data allows to empirically find parameters to correct for scattering in the clouds. Thermal emission is dominated by surface temperature which is a function of surface altitude. Comparison of brightness temperature of atmospherically corrected surface emissions with Magellan altimetry indicates extinction in the lowest atmosphere to increase towards the surface. Actual temperature, scattering and absorption properties are not very well known in this layer, and no further correction for these properties is attempted. Instead local deviations of brightness are analyzed by stacking/mosaicking of images and comparison with Magellan SAR images. Tessera terrain frequently is less bright and several lava streams in the lada area show increased brightness.While this might indicate anomalous surface temperature it is unlikely that such temperature not in equilibrium with the average atmosphere persists as observed on timescales longer than days. Surface emissions are expected to be correlated with FeO content of surface material.In conclusion this might indicate tessera terrain to be more felsic and late stage volcanism to be more mafic than the bulk of venusian plains. There are however some reasons to assume that errors in Magellan altimetry become obvious in comparison with VIRTIS images and that tessera terrain more likely induces a systematic offset than other morphological settings.

Dokumentart:Konferenzbeitrag (Poster)
Titel:Atmospheric correction for VIRTIS VEX images of surface thermal emissions
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Müller, N.NICHT SPEZIFIZIERT
Helbert, J.NICHT SPEZIFIZIERT
Erard, S.LESIA Observatoire de Paris, Paris (France)
Piccioni, G.INAF - IASF Roma, Rome (Italy)
Drossart, P.LESIA Observatoire de Paris, Paris (France)
VIRTIS VEX-Team, NICHT SPEZIFIZIERT
Datum:April 2008
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Band:10
Name der Reihe:Geophysical Research Abstracts
Status:veröffentlicht
Stichwörter:Venus; thermal radiation of surface; VIRTIS; Magellan; altitude - emissivity - correlation
Veranstaltungstitel:European Geosciences Union - General Assembly
Veranstaltungsort:Vienna (Austria)
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2008-04-13 - 2008-04-18
Veranstalter :European Geosciences Union
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EW - Erforschung des Weltraums
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EW - Erforschung des Weltraums
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Vergleichende Planetologie (alt)
Standort: Berlin-Adlershof
Institute & Einrichtungen:Institut für Planetenforschung > Planetenphysik
Hinterlegt von: Stefanie Hempel
Hinterlegt am:29 Apr 2008
Letzte Änderung:27 Apr 2009 14:54

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