## Nomenclature  
\begin{tabular}{l l} _2 AP_ & Solar Tracker System \\ \(B\) & Direct (Beam) horizontal irradiance (BHI, W/m\({}^{2}\)) \\ _Bd_ & Daily Direct (Beam) horizontal irradiation (MJ/m\({}^{2}\)) \\ _Bn_ & Direct (Beam) normal irradiance (BNI, W/m\({}^{2}\)) \\ _Bnd_ & Daily Direct normal irradiation (MJ/m\({}^{2}\)) \\ _BiM_ & Total monthly direct energy received by an incline surface (kWh/m\({}^{2}\)/month) \\ \end{tabular}  
\begin{tabular}{l l} _BSRN_ & Baseline Surface Radiation Network \\ _CCL_ & Configurable Climatological Limits \\ _CDF_ & Cumulative Density Function \\ _d\({}_{n}\)_ & Day number of the year (1..365) \\ \(D\) & Diffuse horizontal irradiance (DHI, W/m\({}^{2}\)) \\ _D\({}_{IM}\)_ & Total monthly diffuse energy received by an incline surface (kWh/m\({}^{2}\)/month) \\ _DPAR_ & Diffuse Photosynthetic Active Irradiance (W/m\({}^{2}\)) \\ _DPAR\({}_{d}\)_ & Daily Diffuse Photosynthetic Active Irradiation (MJ/m\({}^{2}\)) \\ _E\({}_{p}\)_ & Pan A Evaporation (mm/day) \\ _ECV_ & Essential Climate variable \\ _ERL_ & 'Extremely rare' (ERL) limits (W/m\({}^{2}\)) \\ _ESRA_ & European Solar Radiation Atlas \\ _ETR_ & Extraterrestrial Radiation \\ \(G\) & Global solar horizontal irradiance (GHI, W/m\({}^{2}\)) \\ _G\({}_{d}\)_ & Daily global solar irradiation (MJ/m\({}^{2}\)) \\ _G\({}_{m}\)_ & Monthly mean global solar irradiation (MJ/m\({}^{2}\)) \\ _G\({}_{0}\)_ & Extraterrestrial horizontal irradiance (W/m\({}^{2}\)) \\ _G\({}_{0d}\)_ & Daily extraterrestrial irradiation (ETR) (MJ/m\({}^{2}\)) \\ _G\({}_{0n}\)_ & Extraterrestrial normal irradiance (W/m\({}^{2}\)) \\ _G\({}_{c}\)_ & Clear-sky global solar irradiance (W/m\({}^{2}\)) \\ _G\({}_{cd}\)_ & Daily global irradiation for clear-sky conditions (MJ/m\({}^{2}\)) \\ _G\({}_{sc}\)_ & Solar constant (1367 Wm\({}^{2}\)) \\ _G\({}_{max}\)_ & Highest daily global solar irradiance (W/m\({}^{2}\)) \\ _G\({}_{hM}\)_ & Total monthly solar energy received by a horizontal surface (kWh/m\({}^{2}\)/month) \\ _G\({}_{dd}\)_ & Total monthly solar energy received by an inclined surface (kWh/m\({}^{2}\)/month) \\ _GPPFD_ & Total Photosynthetic Photon Flux Density (\(\mu\)mol/s/m\({}^{2}\)) \\ _GPAR_ & Total Photosynthetic Active Irradiance (W/m\({}^{2}\)) \\ _GPAR\({}_{d}\)_ & Daily Total Photosynthetic Active Irradiation (MJ/m\({}^{2}\)) \\ _IQR_ & Interquartile range \\ _k\({}_{d}\)_ & Diffuse fraction (D/G) \\ _K\({}_{D}\)_ & Daily Diffuse fraction (D\({}_{\rm d}\)/G\({}_{\rm d}\)) \\ _k\({}_{dt}\)_ & Diffuse clearness index (D/G\({}_{0}\)) \\ _k\({}_{b}\)_ & Direct fraction (B/G) \\ _K\({}_{B}\)_ & Daily Direct fraction (B\({}_{\rm d}\)/G\({}_{\rm d}\)) \\ _k\({}_{bt}\)_ & Direct transmittance (B/G\({}_{0}\)) \\ _K\({}_{BT}\)_ & Daily Direct transmittance (B\({}_{\rm d}\)/G\({}_{\rm dd}\)) \\ _k\({}_{n}\)_ & Direct Normal clearness index (B\({}_{\rm n}\)/G\({}_{\rm on}\)) \\ _K\({}_{N}\)_ & Daily Direct Normal clearness index (B\({}_{\rm nd}\)/G\({}_{\rm dd}\)) \\ _k\({}_{t}\)_ & Clearness index (G/G\({}_{0}\)) \\ _K\({}_{T}\)_ & Daily clearness index (G\({}_{\rm d}\)/G\({}_{\rm dd}\)) \\ _LF_ & Conversion factor for PAR irradiance (4.57 \(\mu\)mol s\({}^{-1}\) W\({}^{-1}\)) [19] \\ _LT_ & Local time (t) \\ \(m\) & Optical air mass \\ _Max_ & Maximum \\ _Min_ & Minimum \\ _MMH_ & Mean Monthly Hourly \\ \(n\) & Number of observations \\ \(N\) & Number of days \\ _NIR_ & Near Infrared Radiation (W/m\({}^{2}\)) \\ _P\({}_{rs}\)_ & Atmospheric Pressure (P, hPa) \\ _P\({}_{0}\)_ & Standard atmospheric pressure (1013.25 hPa) \\ _PDF_ & Probability Density Function \\ _PDL_ & 'Physically possible' limits (W/m\({}^{2}\)) \\ _P/P\({}_{0}\)_ & Pressure correction for station height \\ _QC_ & Quality control \\ _Q1_ & First Quartile \\ _Q3_ & Third Quartile \\ \end{tabular}