Scientists have known for a long time that the sun has an
11-year cycle during which radiation measured by sunspots on the surface
reaches a peak then falls.
·
The researchers found that a reduction
in ultraviolet (UV) radiation from the sun can affect high-altitude wind
patterns in the Northern Hemisphere, triggering cold winters.
·
Its found that in years of low activity, unusually
cold air forms high in the atmosphere over the tropics. This causes a
redistribution of heat in the atmosphere,
triggering easterly winds that bring freezing weather and snow storms to
northern Europe and the United States and milder weather to Canada and the
Mediterranean.
When solar UV
radiation is stronger, the opposite occurs.
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