Case

Sunspot Number

*Intensity of

UV Radiation

**Outbreak

of AIV

Applicable Regions

1

$\underset{\text{Sun}\to \text{M}in}{\lim }\text{AIV}=1$

Low

Yes (1)

North America, East Asia, west Africa, Europe, South Korea, China, Japan

2

$\underset{\text{Sun}\to \text{M}ax}{\lim }\text{AIV}=0$

Low

No (0)

North America, East Asia, west Africa, Europe, South Korea, China, Japan

3

$\underset{\text{Sun}\to \text{M}in}{\lim }\text{AIV}=0$

High

No (0)

New Zealand, Australia, southern South America, southern Africa, Scandinavian countries, Denmark, northern Russia, and northern Canada