For more information on data format see Section 6 of our latest Operations Report.
|1||DataScan||-||Filename of spectral scan. Filename is of the form SFYYHHMM.DDD, with
||Volume of published data
||Date and Time at start of item 2 of a solar spectral irradiance scan. Date and time refer to Greenwich Mean Time and are encoded into a single number where the integer part is the day number relative to January 1, 1900 (day 1 corresponds to 1/1/1900). The fractional part is the time of day. (For example, the fractional part multiplied with 24 gives the hour of the measurement).
Note: When the file is decoded by Microsoft Excel, the date value will automatically be translated into a correct date/time string, if the box "1904 date system" of the "Tools -> Options -> Calculation"-menu is unchecked.
||Site identifier: 1 = McMurdo Station; 2 = Palmer Station; 3 = South Pole Station; 4 = Ushuaia; 5 = San Diego; 6 = Barrow
|| Solar zenith angle at start of item 2 of a solar spectral irradiance scan
||Solar azimuth angle at start of item 2 of a solar spectral irradiance scan
||Spectral irradiance, integrated between 298.507 and 303.03 nm
|| UV-B irradiance (integration range 290 - 315 nm)
|| UV-B irradiance (integration range 290 - 320 nm)
|| UV-A irradiance (integration range 315 - 400 nm)
||UV-A irradiance (integration range 320 - 400 nm)
||Visible irradiance (integration range 400 - 600 nm)
||Erythemally weighted irradiance (action spectrum by McKinlay, A.F., and B.L. Diffey, CIE Research Note, 6, No.1, 1987).
||DNA weighted irradiance (action spectrum quantifies the potential of UV irradiance to cause damage to DNA. It was suggested by R. B. Setlow in "The wavelengths in sunlight effective in producing skin cancer: a theoretical analysis", Proc. Nat. Acad. Sci., USA, 71 , No. 9, pp. 3363-3366, 1974).
||Spectral irradiance weighted with the "Hunter"-action spectrum (Hunter, J.H., J.H. Taylor, and H.G. Moser, "The effect of ultraviolet irradiation on eggs and larvae of the northern anchovy, Engraulis mordax, and the pacific mackerel, Scomber japonicus, during the embryonic stage", Photochemistry and Photobiology, 29, 325-338, 1979.)
||Spectral irradiance weighted with the "Caldwell"-action spectrum (Caldwell, M. M., "Solar UV irradiation and the growth and development of higher plants," Photophysiology, 6, 131-177, 1971.)
||UV Index is a unit of measure of UV levels relevant to the effects on human skin. It serves as a vehicle to raise public awareness about the potential detrimental effects on health from solar UV exposure and to alert people of the need to adopt protective measures. The UV index is defined as erythemally (CIE) weighted irradiance, expressed in the units W/mē, and multiplied by 40. Note that the UV Index is a dimensionless number. Since "Dose3_CIE_Erythema" (column 13) is given in the units of µW/cm 2, UV Index is calculated by multiplying "Dose3_CIE_Erythema" with 0.4.
Please see Section 4.2.3 of our latest Network Operations report for details on the parametrization of action spectra.