Scattering of Thermal Radiation by Droplets in Venus' Upper Atmosphere

Details Scattering of Thermal Radiation by Droplets in Venus' Upper Atmosphere Scattering of Thermal Radiation by Droplets in Venus' Upper Atmosphere

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.6006d&link_type=abstract

American Astronomical Society, DPS meeting #41, #60.06

Astronomy and Astrophysics

Astronomy

Scientific paper

The Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) on the Venus Express spacecraft has been providing a wealth of data on the Venus atmosphere since its arrival at Venus in 2006. Here, we present results from VIRTIS-IR measurements of the nightside limb of the planet, where we probe the atmosphere above the cloud tops at a range of altitudes. We find that the measurements are dominated by thermal radiation from the lower atmosphere that is scattered into the line of sight by cloud or haze particles. This is even true at 5 micron, the longest wavelength observed by VIRTIS. A limb scattering model is used to analyse the data and put constraints on particle size and vertical distribution of the cloud/haze particles up to an altitude of 90 km.

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