This is just a convenience function that returns the same
weights as CIE as defined by CIE_e_fun but with no option to
change normalization wavelength, and with the wavelength limits adjusted to
those used for UVI. Using std="NOAA" follows the definition in
https://www.esrl.noaa.gov/gmd/grad/neubrew/docs/UVindex.pdf but using
CIE98 as SWF. NOAA definition discards wavelengths shorter than 286.5 nm as
when calculated based on spectral data from Brewer instruments. "WMO" uses
the internationally accepted lower limit at 250 nm. "NOAA" is the default
as this is safer with noisy data for sunlight, and for solar radiation the
value of UVI should be correct. When calculating UVI for radiation spectra
from UV lamps, "WMO" should be used.
UVI_wb(std = "NOAA")a list defining the wavelength range, weighting and normalization. This is just the CIE98 BSWF but with the wavelength limits adjusted to those used for UVI.
"NOAA" or "WMO"
UVI (UV Index) based on Erythema BSWF
World Health Organization, World Meteorological Organization, United Nations Environment Programme & International Commission on Non-Ionizing Radiation Protection. (2002) Global Solar UV Index: A Practical Guide. World Health Organization, Geneva. ISBN 9241590076. https://apps.who.int/iris/handle/10665/42459
P. Kiedron, S. Stierle and K. Lantz (2007) Instantaneous UV Index and Daily UV Dose Calculations. NOAA-EPA Brewer Network. https://www.esrl.noaa.gov/gmd/grad/neubrew/docs/UVindex.pdf
UVI