get_Ra_daily: Extraterrestrial radiation for daily periods, Ra (MJ/m^2/day)
In gopalpenny/fao56:
Description
Usage
Arguments
Details
Examples
View source: R/fao_penman_monteith.R
Description
Get daily extraterrestrial radiation (FAO 56, Ch 3, Eq. 21)
Usage
1
get_Ra_daily(lat, date)
Arguments
lat
latitude in decimal degrees
date
date object or numeric jday
Details
Returns daily extraterrestrial radiation in units of MJ/m^2/day
per FAO 56, Ch 3, Eq. 21. Evaluates the equation
Ra <- 24 * 60 / pi * Gsc * d_r *
(w_s * sin(phi) * sin(delta) + cos(phi) * cos(delta) * sin(w_s))
To do this, it evaluates internal functions to obtain
Gsc solar constant 0.0820, MJ/m^2/day
d_r inverse relative distance Earth-Sun (Equation 23)
w_s sunset hour angle (Equation 25 or 26), rad,
phi latitude (Equation 22), rad
delta solar decimation (Equation 24), rad.
Examples
1
2
3
lat <- -22.9 # Rio de Janeiro
date <- "2019-05-15"
get_Ra_daily(lat, date)
gopalpenny/fao56 documentation built on Feb. 14, 2022, 6:01 a.m.
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Description Usage Arguments Details Examples
View source: R/fao_penman_monteith.R
Description
Get daily extraterrestrial radiation (FAO 56, Ch 3, Eq. 21)
Usage
1 | get_Ra_daily(lat, date)
|
Arguments
lat |
latitude in decimal degrees |
date |
date object or numeric jday |
Details
Returns daily extraterrestrial radiation in units of MJ/m^2/day per FAO 56, Ch 3, Eq. 21. Evaluates the equation
Ra <- 24 * 60 / pi * Gsc * d_r * (w_s * sin(phi) * sin(delta) + cos(phi) * cos(delta) * sin(w_s))
To do this, it evaluates internal functions to obtain Gsc solar constant 0.0820, MJ/m^2/day d_r inverse relative distance Earth-Sun (Equation 23) w_s sunset hour angle (Equation 25 or 26), rad, phi latitude (Equation 22), rad delta solar decimation (Equation 24), rad.
Examples
1 2 3 | lat <- -22.9 # Rio de Janeiro
date <- "2019-05-15"
get_Ra_daily(lat, date)
|
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