Fdif_Neustift

cosipy.modules.radCor.Fdif_Neustift(doy, zeni, Rg)[source]

Estimate the fraction of diffuse radiation.

Adapted from Wohlfahrt et al. (2016). DOI: 10.1016/j.agrformet.2016.05.012.

Defines a clearness index from the ratio between incident global radiation and potential shortwave radiation. This index calibrates an empirical function for the diffuse radiation fraction.

This instance uses calibration data from Neustift.

Parameters:

  • doy (int) – Day of year [-].

  • zeni (float) – Zenith angle of sun [rad].

  • Rg (float) – Incident global shortwave radiation [W m -2].

Returns:

Estimated fraction of diffuse radiation.

Return type:

float