High Spectral Resolution Imaging of Venus' Night Side Using the GSFC Near-IR AOTF Camera.

Details High Spectral Resolution Imaging of Venus' Night Side Using the GSFC Near-IR AOTF Camera. High Spectral Resolution Imaging of Venus' Night Side Using the GSFC Near-IR AOTF Camera.

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.1405h&link_type=abstract

American Astronomical Society, DPS meeting #28, #14.05; Bulletin of the American Astronomical Society, Vol. 28, p.1117

Astronomy and Astrophysics

Astronomy

Scientific paper

Using a newly developed near-IR, acousto-optic tunable filter camera, we have made spectrophotometric observations of thermal emission from the Venus night side atmosphere and polarization measurements of the scattered solar flux from the crescent. Venus was observed May 16-22, 1996 from the Apache Point Observatory, Sunspot, NM using the 3.5-m telescope. Spatial resolution (FWHM) was less than 1.5 arcsec with 0.2 arcsec pixel sampling. The spectral resolving power in the 2.35 micron Venus atmospheric window was approximately 350. Data were also taken in the 1.74 micron window, which provides the deepest view, down to a pressure of 20 bar (brightness temperature, 550 K). Spectral images of Venus were taken within and outside absorption bands in sulfur dioxide, carbon monoxide and water in an attempt to separate the variation of sulfuric acid cloud opacity from the variation of gas absorption below the clouds. A discrete ordinate, multiple scattering code has been implemented in order to more fully explore the near-IR emission from the Venus night side. Since the AOTF Camera is intrinsically a polarization sensitive device, we also made Venus crescent polarization observations. An obvious latitudinal asymmetry in the two orthogonal polarizations is evident. Attempts to understand this in the context of multiple scattering of polarized light using adding/doubling methods is being explored. Results of these analyses will be presented. This work was supported in part by the NASA, Code SR, Planetary Instrument Definition and Development Program.

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