"The arrival of intense cold similar to the one that raged during the “Little Ice Age”, which froze the world during the 17th century and in the beginning of the 18th century, is expected in the years 2030—2040.
These conclusions were presented by Professor V. Zharkova (Northumbria University) during the National Astronomy Meeting...
It is known that the Sun has its own magnetic field, the amplitude and spatial configuration of which vary with time.
There are several cycles with different periods and properties, while the 11-year cycle, the 90-year cycle are the best known of them.
...Its 90-year variation is associated with periodic reduction in the number of spots in the 11-year cycle in the 50-25%.
In 17th century, though, there was a prolonged reduction in solar activity called the Maunder minimum, which lasted roughly from 1645 to 1700.
During this period, there were only about 50 sunspots instead of the usual 40-50 thousand sunspots.
Analysis of solar radiation showed that its maxima and minima almost coincide with the maxima and minima in the number of spots..."