pyet.rad_utils.calc_rso

pyet.rad_utils.calc_rso(ra, elevation, kab=None)

Clear-sky solar radiation [MJ m-2 day-1].

Parameters:

• ra (pandas.Series/xarray.DataArray, optional) – Extraterrestrial daily radiation [MJ m-2 d-1].

• elevation (float/xarray.DataArray, optional) – the site elevation [m].

• kab (float, optional) – coefficient that can be derived from the as and bs coefficients of the Angstrom formula, where Kab = as + bs, and where Kab represents the fraction of extraterrestrial radiation reaching the earth on clear-sky days [-].

Returns:

• pandas.Series/xarray.DataArray, optional containing the calculated Clear-sky solar

• radiation.

Notes

Based on equation 37 in Allen et al. (1998).