Middle infrared thermal maps of Venus at the time of the Galileo encounter
Images of the disk of Venus, taken at wavelengths between 8 and 22 micrometers, were obtained a few days after the Galileo spacecraft's closest approach on February 8, 1990; these images show variations in the thickness of the main H2SO4 cloud deck and the overlying temperature structure. Sever...
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ftnasantrs:oai:casi.ntrs.nasa.gov:19910069535 2023-05-15T18:22:30+02:00 Middle infrared thermal maps of Venus at the time of the Galileo encounter Orton, Glenn S. Friedson, A. J. Martin, Terry Z. Caldwell, John Unclassified, Unlimited, Publicly available Sep 27, 1991 http://ntrs.nasa.gov/search.jsp?R=19910069535 unknown http://ntrs.nasa.gov/search.jsp?R=19910069535 Accession ID: 91A54158 Copyright Other Sources 91 Science; 253; 1536-153 1991 ftnasantrs 2012-02-15T19:07:29Z Images of the disk of Venus, taken at wavelengths between 8 and 22 micrometers, were obtained a few days after the Galileo spacecraft's closest approach on February 8, 1990; these images show variations in the thickness of the main H2SO4 cloud deck and the overlying temperature structure. Several features are qualitatively similar to those of earlier observations, such as a hot region at the south pole, surrounded by a cold 'collar', and brightening toward the lower latitudes, where low-contrast banding appears. The collar does have a northern counterpart that is warmer, however. Equatorial limb darkening is quantitatively similar to that of previous observations; fairly constant at wavelengths up to 20 micrometers, where limb darkening increases substantially. In contrast to what was found in previous observations, polar and equatorial limb darkening are nearly the same at most wavelengths. A longitudinal variation is observable that is consistent with a wavenumber-2 behavior and a brightness maximum near local midnight. Other/Unknown Material South pole NASA Technical Reports Server (NTRS) South Pole Venus ENVELOPE(-57.842,-57.842,-61.925,-61.925) |
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NASA Technical Reports Server (NTRS) |
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91 |
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91 Orton, Glenn S. Friedson, A. J. Martin, Terry Z. Caldwell, John Middle infrared thermal maps of Venus at the time of the Galileo encounter |
topic_facet |
91 |
description |
Images of the disk of Venus, taken at wavelengths between 8 and 22 micrometers, were obtained a few days after the Galileo spacecraft's closest approach on February 8, 1990; these images show variations in the thickness of the main H2SO4 cloud deck and the overlying temperature structure. Several features are qualitatively similar to those of earlier observations, such as a hot region at the south pole, surrounded by a cold 'collar', and brightening toward the lower latitudes, where low-contrast banding appears. The collar does have a northern counterpart that is warmer, however. Equatorial limb darkening is quantitatively similar to that of previous observations; fairly constant at wavelengths up to 20 micrometers, where limb darkening increases substantially. In contrast to what was found in previous observations, polar and equatorial limb darkening are nearly the same at most wavelengths. A longitudinal variation is observable that is consistent with a wavenumber-2 behavior and a brightness maximum near local midnight. |
format |
Other/Unknown Material |
author |
Orton, Glenn S. Friedson, A. J. Martin, Terry Z. Caldwell, John |
author_facet |
Orton, Glenn S. Friedson, A. J. Martin, Terry Z. Caldwell, John |
author_sort |
Orton, Glenn S. |
title |
Middle infrared thermal maps of Venus at the time of the Galileo encounter |
title_short |
Middle infrared thermal maps of Venus at the time of the Galileo encounter |
title_full |
Middle infrared thermal maps of Venus at the time of the Galileo encounter |
title_fullStr |
Middle infrared thermal maps of Venus at the time of the Galileo encounter |
title_full_unstemmed |
Middle infrared thermal maps of Venus at the time of the Galileo encounter |
title_sort |
middle infrared thermal maps of venus at the time of the galileo encounter |
publishDate |
1991 |
url |
http://ntrs.nasa.gov/search.jsp?R=19910069535 |
op_coverage |
Unclassified, Unlimited, Publicly available |
long_lat |
ENVELOPE(-57.842,-57.842,-61.925,-61.925) |
geographic |
South Pole Venus |
geographic_facet |
South Pole Venus |
genre |
South pole |
genre_facet |
South pole |
op_source |
Other Sources |
op_relation |
http://ntrs.nasa.gov/search.jsp?R=19910069535 Accession ID: 91A54158 |
op_rights |
Copyright |
_version_ |
1766201904783687680 |