Direct radiation
The direct radiation is that portion of from a radiation source emitted electromagnetic radiation that has spread to meet an obstruction and thus travels the shortest possible path between the location of its emission and the place where he is without reflected , absorbed , scattered , diffracted or refracted becomes. The resulting non-direct radiation is called diffuse radiation .
In the special case of the earth radiation budget, this is referred to as direct sunlight or shading, so that part of the earth's surface incoming solar radiation and global radiation , which does not match the atmosphere interacted (→ extinction ). While solar radiation above the earth's atmosphere is roughly equivalent to that of black body radiation , mainly direct radiation in the wavelength range 300 nm - 2000 nm arrives at the earth's surface . Since direct solar radiation has short wavelengths compared to so-called diffuse solar radiation , it is also referred to as short-wave solar radiation. However, this term is imprecise and should not be used.
Individual evidence
- ↑ direct sunlight. In: Springer Lexicon of Geosciences. April 17, 2020, accessed April 17, 2020 .
- ^ Wilhelm Kuttler: General climatology (= general geography floor plan ). UTB, 2009, ISBN 978-3-8252-3099-9 , Chapter "4 Radiation and Heat Balance", p. 65-68 .