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The Infrared Cloud Imager observes the Long Wave Infrared emission from clouds and clear sky to produce an image of the overhead clouds independent of sunlight. Clouds and clear sky are separated by modeling of the expected sky emission and observing how the image deviates from the model over time. Once detected the emission from the cloud is isolated and the optical thickness of the cloud can be constrained. Instruments have seen operation from the high mountain environment at the Haleakala Observatory in HI, the cold arctic in Barrow AK, and the hot desert at the Goldstone Deep Space Communication Complex in CA.

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