Spectral Irradiance Data Download
  • In Situ calibrated
  • MLO calibrated
  • Historical Lamp calibrated
    • Weighted Irradiance Data Download
  • Erythemal
  • PAR
    • Derived Products Download
  • UV Index
  • Synthetic Spectra
  • Instantaneous Optical Depths
  • Average Optical Depths
  • UV Irradiance Estimator
    • Climatology Products
  • Daily Sums
  • Hourly Sums
  • US Merged Irradiance Statistics
  • Sums US Contour Maps
    • Instrument Characteristics Download
  • Filter Function Corrections
  • Angular Cosine Corrections
  • Langley Voltage Offsets
  • Serial Number Deployment History
  • Site Location Deployment History
    • Anciliary Measurements Download
  • Internal Head Temperature
  • Air Temp, Humidity, Reflective Solar Irradiance
  • Barometer
  • Electronic Offset(Bias)
  • Cosine Corrected Voltages
  • UVA (uncalibrated)
    • Quality Control Information
  • Data Processing Procedures
  • Data Corrections
  • Quality Control Abbreviations
    • Data Requests
  • FTP Access
  • Usage Statistics
    • Langley Voltage Intercepts
    Langley Voltage Offset or V0 (referred to as V naught) represents a hypothetical voltage reading that the detector amplifier system would have if it were making its measurement at the top of the atmosphere where the optical depth is zero. This instrument characteristic is used to derive a responsivity of the respective channels assuming the extraterrestrial solar spectral irradiance is known and constant.

    Valid date range for location Alaska, Fairbanks, AK01, AK02 is from Sat Aug 26 00:00:00 GMT+00:00 2000 to Mon Jul 31 03:18:31 GMT+00:00 2017

    Location and Time User Inputs
    • Climatological Sites
    • Alaska,Fairbanks
    • Arizona,Flagstaff
    • California,Davis
    • California,Holtville
    • Colorado,Lamar
    • Colorado,Nunn,Pawnee
    • Colorado,Steamboat Springs
    • Florida,Homestead
    • Georgia,Griffin
    • Hawaii,Waimea,Mauna Loa
    • Illinois,Bondville
    • Indiana,West Lafayette
    • Louisiana,Baton Rouge
    • Maine,Presque Isle
    • Maryland,Beltsville
    • Maryland,Queenstown
    • Michigan,Pellston
    • Minnesota,Grand Rapids
    • Mississippi,Starkville
    • Montana,Poplar
    • Nebraska,Mead
    • New Mexico,Las Cruces
    • New York,Geneva
    • New Zealand,Alexandra
    • North Carolina,Raleigh
    • North Dakota,Fargo
    • Ohio,Oxford
    • Oklahoma,Billings
    • Ontario,Toronto
    • Saskatchewan,Regina
    • South Korea,Seoul,NASA,KOREA
    • Texas,El Paso
    • Texas,Houston
    • Texas,Panther Junction,Castolon site end 12-2014
    • Texas,Panther Junction,K-Bar site opened 12-2014
    • Texas,Seguin
    • Utah,Logan
    • Vermont,Burlington
    • Washington,Pullman
    • Wisconsin,Dancy
    • Long Term Research Sites
    • Colorado,Longmont,Perm.Reference,CO97
    • Colorado,Longmont,Table Mountain,CO99
    • Colorado,Nunn,Pawnee
    • Hawaii,Waimea,Mauna Loa,HI00
    • Hawaii,Waimea,Mauna Loa,HI03
    • Hawaii,Waimea,Mauna Loa,HI04,ref
    • Hawaii,Waimea,Mauna Loa,HI05
    • Hawaii,Waimea,Mauna Loa,HI06
    • Hawaii,Waimea,Mauna Loa,HI07
    • Hawaii,Waimea,Mauna Loa,HI08
    • Hawaii,Waimea,Mauna Loa,HI09
    • Hawaii,Waimea,Mauna Loa,HI11
    • Hawaii,Waimea,Forrest Mims,HI21
    • Hawaii,Waimea,Forrest Mims,HI22
    • Hawaii,Waimea,Forrest Mims,HI31
    • Hawaii,Waimea,vis cal,HI41
    • Hawaii,Waimea,vis cal,HI51
    • Hawaii,Waimea,vis cal,HI61
    • Hawaii,Waimea,vis cal,HI71
    • Hawaii,Waimea,vis cal,HI81
    • Louisiana,Baton Rouge,SU-Ag
    • Louisiana,Baton Rouge,SU-Ag
    • Maryland,Greenbelt,NASA,MD21
    • Maryland,Greenbelt,NASA,MD22
    • Maryland,Greenbelt,NASA,MD23
    • Texas,Seguin,vis LED unit
    • Short Term Experimental Research Sites
    • Arizona,Tucson
    • Bolivia,Santa Cruz,NASA MD22 in Bolivia
    • California,Mt. Wilson,SCOS-97
    • California,Mt. Wilson,SCOS-97
    • California,Pasadena,NASA
    • California,Riverside,SCOS-97
    • China,Xianghe,NASA
    • Colorado,Fort Collins,CO22
    • Colorado,Fort Collins,CO23
    • Colorado,Fort Collins,CO24
    • Colorado,Longmont,Table Mountain,CO94
    • Colorado,Longmont,Table Mountain,CO95
    • Colorado,Nunn,CO03
    • Colorado,Nunn,CO04
    • Colorado,Nunn,CO05
    • Colorado,Nunn,CO06
    • Colorado,Nunn,CO07
    • Colorado,Nunn,CO09
    • Colorado,Nunn,CO21
    • Colorado,Nunn,CO31
    • Colorado,Nunn,CO61
    • Colorado,Nunn,CO71
    • Colorado,Nunn,CO81
    • Florida,Gainesville,Portable,FL99
    • Greece,Thessaloniki,NASA
    • Indiana,West Lafayette,Portable,IN99
    • Maine,Howland,data by spcl request
    • Mexico,Mexico City,UTTEC T1,MX01
    • Mexico,Mexico City,2003,MX02
    • Mexico,Mexico City,UNAM CASA,MX03
    • Mexico,Mexico City,IMP T0,MX04
    • Mexico,Mexico City,UTTEC T1,MX05
    • Mississippi,Brooksville,vis-MFRSR only
    • Mississippi,Newton,vis-MFRSR only
    • Mississippi,Stoneville,vis-MFRSR only
    • New York,Geneva,Portable,NY99
    • Norway,Oesteraas,NO02
    • Norway,Oesteraas,NO03
    • Texas,Houston,LaPorte Airport
    • Texas,Houston,LaPorte Airport
    • UAE,Dhabi,NASA