Observation


(Albedo: Ratio between upward and downward global radiation



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meteorological elements
(Albedo: Ratio between upward and downward global radiation
fluxes).
- Terrestrial radiation fluxes (long wave radiation 4 -u)
Terrestrial radiation is to be understood as the thermal
radiation of the earth and the atmosphere.
- Total radiation fluxes
- Total radiation is to be understood as the sum of the solar
and the terrestrial radiation. The flux of both radiation
components passing through a horizontal plane is called net
radiation.
- In agriculture, the spectral distribution of solar
radiation especially in photosynthesis assessments is of
great interest.


12
12 The measuring units of solar energy and their conversion
coefficients are
1 cal*cm-
2
«min-
1
= 4.1868 J • enr

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