mh: Mahmood-Hubbard solar radiation model
In sirad: Functions for Calculating Daily Solar Radiation and Evapotranspiration

Description Usage Arguments Details Value Author(s) References See Also Examples

'mh()' calculates daily solar radiation based on daily temperature range using Mahmood-Hubbard model.

1	mh(days, lat, Tmax, Tmin)

`days`	Vector of class 'Date' of length n.
`lat`	Latitude in decimal degrees.
`Tmax`	Vector of length n containing daily maximum temperature [C].
`Tmin`	Vector of length n containing daily minumum temperature [C].

Mahmood and Hubbard proposed a method for estimating solar radiation from air temperature measurements without a need of calibraing empirical coefficients.

Vector of length n of daily solar radiation [MJm-2].

Jedrzej S. Bojanowski

Mahmood, R., and K.G. Hubbard. 2002. Effect of time of temperature observation and estimation of daily solar radiation for the Northern Great Plains, USA. Agron. J., 94:723-733.

'bc' and 'ha' to calculate solar radiation based on temperature range using different models.

require(zoo)
data(Metdata)
tmax <- Metdata$meteo$TEMP_MAX
tmin <- Metdata$meteo$TEMP_MIN
days <- Metdata$meteo$DAY
lat <- Metdata$LATITUDE
plot(zoo(mh(days=days, lat=lat, Tmax=tmax, Tmin=tmin),order.by=days))