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Overview of Available Data

Instrumentation

NSF network data are based on measurements of:

SUV spectroradiometers measure global (sun+sky) spectral irradiance between 280 and 605 nm on a quarter-hourly basis (hourly before 1997) for solar zenith angles smaller than 93°.
GUV radiometers continuously measure global UV irradiance in 4-5 10-nm wide wavelength bands, and Photosynthetically Active Radiation (PAR).
PSP radiometers measure total short-wave (0.3 - 3.0 µm) irradiance.
TUVR radiometers measure total UV (295 - 385 nm) irradiance.

Data Versions

We are currently producing three different data versions:

  • Preliminary Data
    Include recently collected data. The SUV data set is updated weekly. GUV data are available in near real-time. Data are subject to revision and should be used with caution.

  • "Version 0" Data
    Are final, quality controlled and officially published data. Data are published on CD-ROMs, our ftp site, and are also available via our interactive retrieval system. Data is available for all sites. Version 0 SUV data have NOT been corrected for the instrument's cosine error.

  • "Version 2" Data
    This data set is our newest data release, featuring higher accuracy and more data products than "Version 0". Data have been corrected for the cosine error.
Note that "Version 1" does not exist. As the original (=first) version was called "Version 0", we decided to call the new version "Version 2" to avoid confusion.

Data Details

SUV data, "Version 0"

  • Solar spectra in full spectral resolution between 280 and 605 nm.
    Detailed Description

  • Databases in ASCII format with measurements at specific wavelengths. These databases are referenced as Database 2.

  • Databases with spectral integrals (e.g., UV-B and UV-A) and weighted spectral irradiances ("dose rates"). A total of six biological action spectra have been implemented, including the CIE action spectrum for erythema and Setlow's action spectrum for DNA damage. These databases are referenced as Database 3.

  • Databases with daily doses that were calculated by integrating spectral integrals and dose rates over time. These databases are referenced as DailyDose.

  • PSP and TUVR measurements. These measurements are part of all databases.

  • Databases with system parameters, which are helpful for quality control named Database 1 and Database 5.

  • NASA/TOMS ozone data for spectroradiometer sites.

  • Weather data for the spectroradiometer sites for the periods of interest (purchased from the National Climatic Data Center).
See Section 6 of the Volume 10 Network Operations Report for more information on Version 0 SUV data.

 
GUV data

Note that GUV data are less accurate than SUV data, in particular at large solar zenith angles and short wavelengths. However, GUV data have a better temporal resolution.

  • GUV data measured concurrently with SUV spectra. Data products include spectral irradiance at various wavelengths, integrals, dose-rates, total column ozone, and PAR. This data set is referenced as GUV Database 1 (PDF file)

  • Minute-by-minute measurements GUV measurements
    (GUV Database 2 (PDF file))

 
SUV data, "Version 2"

    Click here for an overview of Version 2 data products.
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