ExRad: Extraterrestrial Radiation for Daily Periods (R_a)

In FAO56: Evapotranspiration Based on FAO Penman-Monteith Equation

Extraterrestrial Radiation for Daily Periods (R_a)

Description

ExRad returns the value of extraterrestrial radiation [MJ/(m^2\times day)].

Usage

ExRad(d_r, omega_s, phi, delta, G_sc = 0.082)

Arguments

d_r	A numeric scalar that denotes the inverse relative earth-sun distance.
omega_s	A numeric scalar that denotes the sunset hour angle [rad].
phi	A numeric scalar that denotes the latitude [rad].
delta	A numeric scalar that denotes the solar declination [rad].
G_sc	A numeric scalar that denotes the solar constant = 0.0820 [MJ/(m^2\times min)].

Details

This is a function to calculate the extraterrestrial radiation.

Value

The function returns the value of extraterrestrial radiation as a numeric scalar.

Reference

Allen, R. G., Pereira, L. S., Raes, D., & Smith, M. (1998). Crop evapotranspiration - Guidelines for computing crop water requirements - FAO Irrigation and drainage paper 56. Fao, Rome, 300(9), D05109.

See Also

EarSunDis, SunHA, SolDec, SolRad, CSSRad.

Examples

ExRad(d_r = 0.985, omega_s = 1.527, phi = -0.35, delta = 0.12)

FAO56 documentation built on Nov. 15, 2023, 1:07 a.m.