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Table 1

UV-A and UV-B flux at top of atmosphere (ITOA) and the surface (Isurface) for different cases, wavelength-range averaged flux ratio R = Isurface/ITOA (i.e. atmospheric transmission coefficient), and biologically weighted surface UV flux W (in weighted W/m2).

Column 1 Column 2 3 4 5 6 7 8 9

Case RUV - A RUV - B W
[] [W/m2] [W/m2] [W/m2] [W/m2] [W/m2]

E 1.0 127 90.41 0.71 18.29 2.264 0.12 0.126
E no GCR 127 90.41 0.71 18.29 2.256 0.12 0.125
CA 0.0 2.01 1.479 0.74 0.202 0.0225 0.11 0.0021
CA 0.1 2.01 1.479 0.74 0.202 0.0221 0.11 0.0020
CA 1.0 2.01 1.477 0.74 0.201 0.0204 0.10 0.0016
CA 10.0 2.01 1.477 0.74 0.200 0.0198 0.10 0.0015
CA no GCR 2.01 1.477 0.74 0.200 0.0197 0.10 0.0015
LF 0.0 112 75.75 0.68 47 3.053 0.065 0.145
LF 0.1 112 75.75 0.68 47 3.054 0.065 0.145
LF 1.0 112 75.79 0.68 47 3.084 0.066 0.148
LF 10.0 112 75.80 0.68 47 3.099 0.066 0.149
LF no GCR 112 75.81 0.68 47 3.100 0.066 0.150
SF 0.0 112 76.50 0.68 47 5.10 0.11 0.55
SF 0.1 112 76.47 0.68 47 5.00 0.11 0.52
SF 1.0 112 76.37 0.68 47 4.65 0.10 0.42
SF 10.0 112 76.33 0.68 47 4.52 0.10 0.39
SF no GCR 112 76.33 0.68 47 4.51 0.10 0.39

Notes. Cases: E = Earth, CA = chromospherically active star, LF = long flare, SF = short flare (see text for details).

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