Many scientists are believing a Dalton like solar minimum appears a real possibility given the recent solar behavior. Even David Hathaway of NASA has recently conceded that 'possibility' to the
New York Times here.
I received this email from Dr. Richard Mackey of Australia, a solar statistician expert and peer-reviewed author on solar climate factors. I thought you might find his comments and insight interesting. In it he discusses the extreme scenario that the current solar cycle, the longest in at least 150 years and with more sunspotless days (689 days as of today - more than double the number in the cycles the last half century) during this transition could be telegraphing.
Astronomer Emeritus Dr. William Livingston and Associate Astronomer Dr Matthew Penn have for many years been measuring the magnetic field strength of the Sun's magnetic fields. See for example this
post. WUWT in June this year published
a report by them concluding that, broadly speaking, over the last 15 years the magnetic field strengths of sunspots were decreasing with time independently of the sunspot cycle. A simple linear extrapolation of the magnetic data collected by their special observatory (the McMath-Pierce telescope) suggests that sunspots might largely vanish in five years time. In addition, other scientists report that the solar wind (a large proportion of the Sun's output of matter in the plasma form) is in a lower energy state than found since space measurements began nearly 40 years ago.
In answer to the question: Why is a lack of sunspot activity interesting?, Livingston and Penn answer: "During a period from 1645 to 1715 the Sun entered an extended period of low activity known as the Maunder Minimum. For a time equivalent to several sunspot cycles the Sun displayed few sunspots. Models of the Sun's irradiance suggest that the solar energy input to the Earth decreased during that epoch, and that this lull in solar activity may explain the low temperatures recorded in Europe during the Little Ice Age".