SOLIS                   DNI under clear sky conditions (Solar Energy,
                        82(8), 758-762)
TOA                     Calculation of the Top of Atmosphere (TOA)
                        solar irradiance on a horizontal plane
adapt_process           Site adaptation of solar irradiance modeled
                        series with coincident ground measurements
calibration_2016        Dataframe object with solar radiation series
                        for calibration.
m_Kasten                Calculation of relative air mass based on
                        Kasten parametrization
observed_2013_2016      Dataframe object with ground measured solar
                        radiation.
post_process            Postprocessing of adapted solar irradiance
pre_process             Preprocessing of solar irradiance series Site
                        adaptation
site_adapt              Site Adaptation of Solar Irradiance Modeled
                        Series with Coincident Ground Measurements
target_2013_2016        Dataframe object with modeled solar radiation
                        series.
