pyet.rad_utils.calc_rad_sol_in

pyet.rad_utils.calc_rad_sol_in(n, lat, as1=0.25, bs1=0.5, nn=None)

Incoming solar radiation [MJ m-2 d-1].

Parameters:

• n (pandas.Series or xarray.DataArray) – actual duration of sunshine [hour].

• lat (float, optional) – the site latitude [rad].

• as1 (float, optional) – regression constant, expressing the fraction of extraterrestrial reaching the earth on overcast days (n = 0) [-].

• bs1 (float, optional) – empirical coefficient for extraterrestrial radiation [-].

• nn (pandas.Series/float, optional) – maximum possible duration of sunshine or daylight hours [hour].

Return type:

pandas.Series containing the calculated net shortwave radiation.

Notes

Based on equation 35 in Allen et al. (1998).