sur_rad: Estimate daily solar radiation.

In Sibada/sibadaR: Sibada's accumulated R scripts for next probably use to avoid reinventing the wheel.

Description

Estimate daily solar radiation at crop surface [MJ m-2 day-1] by providing sunshine duration (SSD) in hours.

Usage

sur_rad(ssd, lat, dates = NULL, a = 0.25, b = 0.5)

Arguments

ssd	sunshine duration [hours].
lat	Latitude [degree].
dates	A R Date type of a vector of Date type. If not provided, it will Regard the ssd series is begin on the first day of a year.
a	Coefficient of the Angstrom formula. Determine the relationship between ssd and radiation. Default 0.25.
b	Coefficient of the Angstrom formula. Default 0.25

Value

Solar radiation at crop surface [MJ m-2 day-1].

References

Martinezlozano J A, Tena F, Onrubia J E, et al. The historical evolution of the Angstrom formula and its modifications: review and bibliography.[J]. Agricultural & Forest Meteorology, 1985, 33(2):109-128.

Sibada/sibadaR documentation built on Jan. 31, 2020, 6:40 p.m.