One of the trolls has his diaper in a knot over my comment that we are slipping into a lull in solar activity. And dares me to support my statement. OK.
Remembering that those who are determined to believe are not easily convinced, let me point out the fact that sunspot activity has been linked to soar irradiance since 1808. The year Sir William Herschel linked abundant corn (wheat) crops with years of elevated sunspot activity. We have almost 300 years of market records, and when the sunspots are low, wheat is dear.
And, by tracking the Zeeman effect, it was found that sunspot minimums are periods of weaker than normal solar magnetic fields.
With that, let me NASA Science News, covering the research of Matt Penn and Bill Livingston, who noted a long term decline in the size and darkness of sunspots, coupled with a reduction in our variable star’s magnetic field.
If Livingston and Peen did not quite shoot the X ring out of the center of the target, they came extremely close. The graph at the link shows a long term decline in both sunspot “blackness” and the sunspot magnetic field. Which was bumping the bottom of the chart the last time I looked, and is probably below 100 at this time.
The many clusters of small earthquakes, common now in areas outside earthquake zones such as the New Madrid Fault, were also a feature of past climate minimums, as were major earthquakes such as the Lisbon, and major volcanic activity, such as Tambora near the close of the Dalton minimum.
At the same time, “proxies,” stand-ins for recording thermometers and chart recorders, tell us that arctic vegetation thrived at relatively low latitudes and low altitudes as little as 600 years ago.
I often refer to the “Dryas stadials,” cold periods in which the arctic dryas plant thrived in low lying parts of Europe.
In past climate minimums, the dryas extended its range southward. The same periods other proxies tell us that the earth’s, and therefore the sun’s, magnetic field was weak. And periods ancient Chinese records tell those who will look that there were few or no sunspots.
And all that is less than the tip of the scientific iceberg. It is in fact no more than a chip off the tip of the iceberg.
While it is not possible to convince someone determined not to be convinced, it is not hard to lay out the facts and let those with open minds decide.