These high clouds are called Cirrus Radiatus and are made of ice crystals about 10km (6 miles) above the Earth's surface. Although the clouds appear to radiate, or come from a point on the distant ...

PREMIUM Where are they going? They just won’t say: Cumulus clouds race across the sky. (Shutterstock) At any given moment, the sky over two-thirds of the planet’s surface is covered by clouds.

the temperature becomes cold enough for ice clouds, or cirrus, to form. Clouds made up entirely of ice are usually more transparent. In some cases, you can see the sun or moon through them.

The results compare favourably with observations and support interpretations of insitu, satellite and lidar observed aviation impact on cirrus clouds. CoCiP can be used to predict and minimize the ...