Observations of the phase variation of Venus CO2 equivalent widths

Details Observations of the phase variation of Venus CO2 equivalent widths Observations of the phase variation of Venus CO2 equivalent widths

Mar 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977icar...30..551b&link_type=abstract

Icarus, vol. 30, Mar. 1977, p. 551-558.

Physics

5

Absorption Spectra, Carbon Dioxide, Phase Deviation, Spectral Line Width, Venus Atmosphere, Angular Distribution, Data Reduction, Mie Scattering, Molecular Absorption, Venus Clouds

Scientific paper

Equivalent widths determined from photoelectric scans of Venus CO2 absorption lines measured at phase angles of 5.1 to 170 deg are presented. The data-reduction procedure is described in detail, and phase curves are plotted for three model atmospheres in which CO2 is homogeneously mixed with Mie-scattering particles or inhomogeneously mixed with Henyey-Greenstein particles. All three data sets are found to indicate that the equivalent-width maximum occurs at a phase angle much lower than 100 deg. It is concluded that two scattering layers are not required on Venus to explain the shape of the observed phase curve and that the mixing ratio of scattering particles to CO2 increases with depth at high altitudes.

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