Apogee Instruments SU-300-SS Gebruikershandleiding - Pagina 15
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Converting from UV Index to UV-B in Units of W m
There is a relatively linear relationship between UV Index and UV-B irradiance for sunlight (see graph below),
suggesting UV-B irradiance can be approximated from UV Index measurements from the SU-300 UV-I/UV-B sensor.
To convert from UV Index to UV irradiance in units of W m
below).
UV-B irradiance (in units of W m
) by the average energy content of solar UV-B photons, 0.384 J per mol. To convert UV Index to UV-
-2
units of W m
B photon flux density, divide the UV Index measurement by 2.2 (slope of the line in the graph below multiplied by
0.384 J per mol).
12
11
10
9
8
7
6
5
4
3
2
1
0
0.0
0.2
Relationship between UV Index and UV-B irradiance (in units of W m
spectra representing a wide range of atmospheric conditions. Slope of the line is 5.7, with an r
-2
-2
) can be converted to UV-B photon flux density by dividing UV-B irradiance (in
0.4
0.6
0.8
UV-B Irradiance [W m
and mol m
-2
-1
s
-2
, divide UV Index by 5.7 (slope of the line in the graph
1.0
1.2
1.4
-2
]
-2
). Data are from multiple solar
1.6
1.8
2.0
2
= 0.99.