FAA Aircraft Dispatcher Practice Exam

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What do visible satellite images primarily display?

Surface temperature variations
Cloud cover
Water vapor content
Storm systems

The correct answer is: Cloud cover

Visible satellite images primarily display cloud cover as they capture sunlight reflected off the Earth’s surface and its atmosphere. These images are taken during daylight hours when sunlight is abundant, allowing for the visualization of clouds in detail. The bright areas indicate clouds, while darker areas typically represent clear skies or land and water surfaces. While storm systems may be indicated by the presence of clouds, visible images do not provide specific details about those systems, such as their intensity or storms' movement. Similarly, they do not depict surface temperature variations or water vapor content, which require different types of sensors or imaging techniques. Therefore, the primary function of visible satellite imagery is to show where clouds are located in the atmosphere.