Solar radiation is a term used to describe visible & near-visible (Ultraviolet & Near-Infrared) radiation emitted from the sun

Radiation regions are described by their wave-length range (250 to 100,000 nm)

Approximately 99% of solar radiation at the earth's surface is contained in the wave- length range between 300 to 3,000 nm

Solar energy is affected by season, time of day, latitude, elevation, & meteorological conditions (cloud cover, rain, snow, humidity etc,) which vary by location