The Sun activity increases during every ...
5 years
11 years
22 years
1300 years
Solar cycles have an average duration of about 11 years. The periodic changes in the Sun's activity include changes of the levels of solar radiation and the number and size of sunspots.
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answers
France
19
Austria
73
Greece
19
the Netherlands
12
Republic of Ireland
12
Germany
388
Pakistan
24
Canada
21
the United Kingdom
124
the United States
226
Australia
43
Switzerland
33
India
381
Poland
8001
the United Arab Emirates
15
the Philippines
32
Unknown
16