Journal
SCIENCE
Volume 306, Issue 5702, Pages 1753-1756Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1104474
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A visible atmospheric optical depth of 0.9 was measured by the Spirit rover at Gusev crater and by the Opportunity rover at Meridiani Planum. Optical depth decreased by about 0.6 to 0.7% per sol through both 90-sol primary missions. The vertical distribution of atmospheric dust at Gusev crater was consistent with uniform mixing, with a measured scale height of 11.56+/-0.62 kilometers. The dust's cross section weighted mean radius was 1.47+/-0.21 micrometers (mum) at Gusev and 1.52+/-0.18 pm at Meridiani. Comparison of visible optical depths with 9-mum optical depths shows a visible-to-infrared optical depth ratio of 2.0+/-0.2 for comparison with previous monitoring of infrared optical depths.
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