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An extremely important application of the 3.9 and 10.7 micron channels in combination is the detection of fog at night.
The brightness temperature of water clouds at night is less in the 3.9 micron channel than the 10.7 micron channel because of differences in cloud top emissivity.
An image product, commonly referred to as the fog product, may be derived using this property.
Since the fog product also detects stratus and other water clouds, there are situations where this product will be compromised.
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