Evidence for anomalous cloud particles at the poles of Venus

Details Evidence for anomalous cloud particles at the poles of Venus Evidence for anomalous cloud particles at the poles of Venus

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf..178w&link_type=abstract

European Planetary Science Congress 2008, Proceedings of the conference held 21-25 September, 2008 in Münster, Germany. Online a

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An analysis of near-infrared emissions on the nightside of Venus observed by the VIRTIS instrument onboard Venus Express reveals anomalous cloud particles in the polar regions of Venus. These anomalous particles are found within the centers of polar vortices at both poles, and are either larger or different in composition from those elsewhere in the planet. We find no persistent latitudinal variation in cloud properties at low- to mid-latitudes, nor do we find asymmetry between the Southern and Northern hemispheres. These findings arise from analysis of the relative brightness of 1.74 and 2.30 μm infrared radiation thermally emitted from the deep atmosphere of Venus. Larger cloud particles cause relatively more attenuation at 2.30 μm than at 1.74 μm, so we use a `size parameter', m = ( I1.74μm ) / ( I2.30μm )0.53 as a proxy for particle size. This methodology follows that of Carlson et al. [1993], supported by new radiative transfer modelling.

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