Solar radiation based in Angstrom formula (sr_ang)

If global radiation is not measure at station, it can be estimated with this function.

Usage

sr_ang_calculation(latitude, date, n, as, bs)

Arguments

latitude

A dataframe with latitude in decimal degrees that you want to calculate the ra.

date

A dataframe with the dates that you want to calculate the ra.

n

The actual duration of sunshine. This variable is recorded with Campbell-Stokes sunshine recorder.

as

A dataframe with latitude in decimal degrees that you want to calculate the ra. The values of as = 0.25 is recommended by Allen et al. (1998).

bs

A dataframe with the dates that you want to calculate the ra. The values of bs = 0.50 is recommended by Allen et al. (1998).

Value

A data.frame object with solar radiation data

Author

Roberto Filgueiras, Luan P. Venancio, Catariny C. Aleman and Fernando F. da Cunha

Examples

if (FALSE) { # \dontrun{
sr_ang <- sr_ang_calculation(latitude, date, n, as, bs)
} # }