Computer Science
Scientific paper
Jun 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jats...32.1157l&link_type=abstract
Journal of the Atmospheric Sciences, vol. 32, June 1975, p. 1157-1163.
Computer Science
4
Infrared Radiation, Light Scattering, Optical Polarization, Planetary Radiation, Thermal Emission, Venus Atmosphere, Atmospheric Scattering, Brightness Temperature, Cloud Cover, Optical Depolarization, Optical Reflection, Refractivity, Sulfuric Acid
Scientific paper
The polarization of Venus at 2.2, 3.5 and 4.8 microns, measured through a 4 arcsec aperture at several phase angles, is presented and compared with the predictions of multiple scattering calculations using the optical constants of sulfuric acid. To determine the fraction of light which is thermally emitted, drift scans were made across Venus at 3.5, 4.8 and 8.4 microns. The large positive polarization (about 40%) observed at 3.5 microns is consistent with the large imaginary part k of the index of refraction of H2SO4 at that wavelength which minimizes the depolarization from high-order scattering. The lack of observed polarization at 4.8 microns is not consistent with the large value of k there, in spite of dilution of the scattered light by a large thermal component. At 2.2 microns, Venus has a neutral point and no polarization is observed.
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