##############################################################################
# Meteorological Data provided by
# Albert-Ludwigs-Universitaet Freiburg
# Institute of Earth and Environmental Sciences
# Chair of Environmental Meteorology
# Prof. Dr. Andreas Christen
# Werthmannstrasse 10, 79085 Freiburg, Germany
# meteo@meteo.uni-freiburg.de
##############################################################################

Station Name: Freiburg-Chemiehochhaus
Station ID: FRCHEM
Station Address: Albertstrasse 21, Freiburg im Breisgau, Germany
Station Longitude: 7.84861 deg E
Station Latitude: 48.0011 deg N
Station Elevation: 323.5 m
Variable: SolarIrradiance
Unit: W_m2
Height: 2m above roof level
Instrument/Source: Actively ventilated pyranometer (Kipp & Zonen CM21)

List of files
* FRCHEM_2016_SolarIrradiance_10min_UTC.csv
* FRCHEM_2016_SolarIrradiance_30min_UTC.csv
* FRCHEM_2016_SolarIrradiance_Hourly_UTC.csv
* FRCHEM_2016_SolarIrradiance_Daily_UTC.csv
* FRCHEM_2016_SolarIrradiance_Monthly_UTC.csv
* FRCHEM_2016_SolarIrradiance_Yearly_UTC.csv

Column descriptions: FRCHEM_2016_SolarIrradiance_10min_UTC.csv
* SolarIrradiance_Avg_W_m2 = 10min average of SolarIrradiance in W_m2
* ExtraterrestrialIrradiance_Avg_W_m2 = 10min average of modeled extraterrestrial irradiance in W_m2
* Ratio_SolarIrradiance_to_ExtraterrestrialIrradiance = 10min ratio of SolarIrradiance to modeled extraterrestrial irradiance
* SolarIrradiance_gap_filled_percent = fraction of 10min that was gap filled in %
* SolarIrradiance_missing_data_percent = fraction of 10min that has missing data in %
* Error value: -9999

Column descriptions: FRCHEM_2016_SolarIrradiance_30min_UTC.csv
* SolarIrradiance_Avg_W_m2 = 30min average of SolarIrradiance in W_m2
* ExtraterrestrialIrradiance_Avg_W_m2 = 30min average of modeled extraterrestrial irradiance in W_m2
* Ratio_SolarIrradiance_to_ExtraterrestrialIrradiance = 30min ratio of SolarIrradiance to modeled extraterrestrial irradiance
* SolarIrradiance_gap_filled_percent = fraction of 30min that was gap filled in %
* SolarIrradiance_missing_data_percent = fraction of 30min that has missing data in %
* Error value: -9999

Column descriptions: FRCHEM_2016_SolarIrradiance_Hourly_UTC.csv
* SolarIrradiance_Avg_W_m2 = hourly average of SolarIrradiance in W_m2
* ExtraterrestrialIrradiance_Avg_W_m2 = hourly average of modeled extraterrestrial irradiance in W_m2
* Ratio_SolarIrradiance_to_ExtraterrestrialIrradiance = hourly ratio of SolarIrradiance to modeled extraterrestrial irradiance
* SolarIrradiance_gap_filled_percent = fraction of hour that was gap filled in %
* SolarIrradiance_missing_data_percent = fraction of hour that has missing data in %
* Error value: -9999

Column descriptions: FRCHEM_2016_SolarIrradiance_Daily_UTC.csv
* SolarIrradiance_Avg_W_m2 = daily average of SolarIrradiance in W_m2
* ExtraterrestrialIrradiance_Avg_W_m2 = daily average of modeled extraterrestrial irradiance in W_m2
* Ratio_SolarIrradiance_to_ExtraterrestrialIrradiance = daily ratio of SolarIrradiance to modeled extraterrestrial irradiance
* No_of_hours_with_max_SolarIrradiance_ge_5_W_m2 = Number of hours with a maximum SolarIrradiance greater equal 5 W_m2
* No_of_hours_with_max_SolarIrradiance_ge_120_W_m2 = Number of hours with a maximum SolarIrradiance greater equal 120 W_m2
* SolarIrradiance_gap_filled_percent = fraction of day that was gap filled in %
* SolarIrradiance_missing_data_percent = fraction of day that has missing data in %
* Error value: -9999

Column descriptions: FRCHEM_2016_SolarIrradiance_Monthly_UTC.csv
* SolarIrradiance_Avg_W_m2 = monthly average of SolarIrradiance in W_m2
* ExtraterrestrialIrradiance_Avg_W_m2 = monthly average of modeled extraterrestrial irradiance in W_m2
* Ratio_SolarIrradiance_to_ExtraterrestrialIrradiance = monthly ratio of SolarIrradiance to modeled extraterrestrial irradiance
* No_of_hours_with_max_SolarIrradiance_ge_5_W_m2 = Number of hours with a maximum SolarIrradiance greater equal 5 W_m2
* No_of_hours_with_max_SolarIrradiance_ge_120_W_m2 = Number of hours with a maximum SolarIrradiance greater equal 120 W_m2
* No_of_days_with_max_SolarIrradiance_ge_5_W_m2 = Number of days with a maximum SolarIrradiance greater equal 5 W_m2
* No_of_days_with_max_SolarIrradiance_ge_120_W_m2 = Number of days with a maximum SolarIrradiance greater equal 120 W_m2
* SolarIrradiance_gap_filled_percent = fraction of month that was gap filled in %
* SolarIrradiance_missing_data_percent = fraction of month that has missing data in %
* Error value: -9999

Column descriptions: FRCHEM_2016_SolarIrradiance_Yearly_UTC.csv
* SolarIrradiance_Avg_W_m2 = yearly average of SolarIrradiance in W_m2
* ExtraterrestrialIrradiance_Avg_W_m2 = yearly average of modeled extraterrestrial irradiance in W_m2
* Ratio_SolarIrradiance_to_ExtraterrestrialIrradiance = yearly ratio of SolarIrradiance to modeled extraterrestrial irradiance
* No_of_hours_with_max_SolarIrradiance_ge_5_W_m2 = Number of hours with a maximum SolarIrradiance greater equal 5 W_m2
* No_of_hours_with_max_SolarIrradiance_ge_120_W_m2 = Number of hours with a maximum SolarIrradiance greater equal 120 W_m2
* No_of_days_with_max_SolarIrradiance_ge_5_W_m2 = Number of days with a maximum SolarIrradiance greater equal 5 W_m2
* No_of_days_with_max_SolarIrradiance_ge_120_W_m2 = Number of days with a maximum SolarIrradiance greater equal 120 W_m2
* SolarIrradiance_gap_filled_percent = fraction of year that was gap filled in %
* SolarIrradiance_missing_data_percent = fraction of year that has missing data in %
* Error value: -9999


Data processing details
Data between 2016-05-22T17:30:00Z and 2016-05-22T17:40:00Z [2 record(s)] deleted due to unrealistic low values.
Data between 2016-05-22T17:30:00Z and 2016-05-22T17:40:00Z [2 record(s)] filled using linear interpolation.
Data between 2016-07-12T18:20:00Z and 2016-07-12T18:20:00Z [1 record(s)] deleted due to unrealistic low values.
Data between 2016-07-12T18:20:00Z and 2016-07-12T18:20:00Z [1 record(s)] filled using linear interpolation.
Data between 2016-08-23T06:10:00Z and 2016-08-23T09:30:00Z [21 record(s)] filled using data from site HARTHM (GLOBAL_AVG)
No data deleted due to outliers / errors / missing values.
No data deleted due to unrealistic high values.
No data filled using nearest neighbor.
Files created: Tue Feb 10 20:09:57 2026
