Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icar...63..217n&link_type=abstract
Icarus (ISSN 0019-1035), vol. 63, Aug. 1985, p. 217-221.
Astronomy and Astrophysics
Astronomy
Astronomical Photometry, Haze, Infrared Photometry, Periodic Variations, Radiant Flux Density, Venus Clouds, Diurnal Variations, Narrowband, Venus Atmosphere, Venus, Infrared, Wavelengths, Photometry, Flux, Haze, Particles, Analysis, Procedure, Clouds, Layers, Optical Properties
Scientific paper
Narrowband filter (3.6-micron wavelength, 0.08-micron bandwidth) observations of the infrared flux of Venus are reported. The observations over the period from 1982 through 1984 covered a range of phase angle from 27 to 94 degrees. Normalized values of flux at the Venus-earth distance of 1 AU were (4.0-5.4) x 10 to the -17th watt per square centimeter per inverse centimeter, and the phase angle dependence of the data is rather weak. Furthermore, when the evening terminator of Venus was seen, lower values of flux were obtained, in contrast with higher values at the morning terminator. The phase angle dependence is quite different from that of Martonchik and Beer (1975), the difference possibly suggesting an intrinsic time variation of haze particles over ten years in the upper haze layer of the Venus cloudcover.
Mukai Sadaatsu
Mukai Tadashi
Nagata Takahiro
Sato Sasumu
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