However, this prediction smells like bunk to me.
The normal fluctuation in the Sun's intensity, the 11-year sunspot cycle, has an amplitude of about 0.1%. By comparison, 60% is huge.
If the Sun's output decreased by 60%, what would be the resulting change in the Earth's temperature??
Here's a very rough estimate. Assume that the surface temperature is proportional to the Suns power output, raised to the 1/4 power.
Then a decrease of the Sun’s output by 60% would cause a new temperature proportional to
(1.0 - 0.6)0.25 = (0.4)0.25 = 0.79,
which means a decrease of 21% in the absolute (Kelvin) temperature.
Since the surface temperature is about 15 C or 288 K, the change in temperature of 21% is about 60 degrees C. It only took a decrease of about 7 or 8 C to cause the last Ice Age!!
The estimate could of course be refined, but it would not change the conclusion: If the Sun's output decreases by 60%, it would cause an extremely cold ice age.
IF (and it could be a big "IF") UPI* has accurately represented Prof. Zkarkova accurately,
then there are only two possibilities:
Or Zharkova could be mistaken.
*Dunno if it's still true, but at one time, UPI was owned by Rev. Sun Myung Moon and the Unification Church, who do not exactly have a great reputation for accuracy.