Parameter Tree:
EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC RADIATION > INCOMING SOLAR RADIATION

Definition:
In general, solar radiation received at the earth's surface. The amount of direct solar radiation incident upon a unit horizontal surface at a specific level on or above the surface of the earth. Incoming solar radiation is solar radiation that has not been scattered or absorbed.

Reference:
Adapted from the American Meteorological Society Glossary of Meteorology. http://amsglossary.allenpress.com/glossary/