ExtraTerrestrialRadiation {meteor}

Extra-terrestrial Radiation

Description

Compute incoming radiation (J day-1 m-2 ) at the top of the atmosphere and photoperiod (daylength, sunshine duration).

Usage

ExtraTerrestrialRadiation(doy, latitude, sc=1367.7, FAO=FALSE)

Arguments

doy

integer. Day of the year

latitude

numeric. Latitude

sc

numeric. The solar constant

FAO

logical. If TRUE the algorithm described by Allen et al (1998) is used. If FALSE the approach by Goudriaan and Van Laar (1995) is used

Value

matrix with incoming radiation (J/day) and

Author(s)

Robert Hijmans, based on Python meteolib by Maarten J. Waterloo and J. Delsman http://python.hydrology-amsterdam.nl/

References

Goudriaan and Van Laar, 1995.

R.G. Allen, L.S. Pereira, D. Raes and M. Smith (1998). Crop Evaporation - Guidelines for computing crop water requirements. Irrigation and drainage paper 56. FAO, Rome, Italy. https://www.fao.org/3/x0490e/x0490e07.htm

Examples

ExtraTerrestrialRadiation(50, 60)
ExtraTerrestrialRadiation(50, 60, FAO=TRUE)