farms.utilities.linear_variability

farms.utilities.linear_variability(csr, var_frac)[source]

Return an array with a linear relation between clearsky ratio and maximum variability fraction. Each value in the array is the maximum variability fraction for the corresponding clearsky ratio.

Parameters:

csr (np.ndarray) – REST2 clearsky irradiance without bad or missing data. This is a 2D array with (time, sites).
var_frac (float) – Maximum variability fraction (0.05 is 5% variability).

Returns:

out (np.ndarray) – Array with shape matching csr with maximum variability (var_frac) when the csr = 1 (clear or thin clouds). Each value in the array is the maximum variability fraction for the corresponding clearsky ratio.