For instance, UV
radiation amounts to a mere 7 % of
solar energy, but its variation
produces changes in the stratosphere near the Equator, all the way to the polar regions, which govern climate.
According to their modeling studies, the difference
in the amount of incoming
solar radiation,
in this case, primarily
in the ultraviolet (UV) wavelengths, during the minima and maxima of the 11 - yr
solar cycle are large enough to
produce a characteristic
change in the winter circulation pattern of the atmosphere over North America... When the NAO is
in its negative phase, more cold air can seep south from the Arctic and impact the lower latitudes of Europe and the eastern U.S., which helps spin up winter storm systems.