Austin, October 17, 2014 – Something unprecedented happened last month. With a burst of sunspot activity, Solar Cycle 24 now has the highest secondary peak compared to its first in the entire sunspot record. Cycle 24 continues to defy the experts.
As the solar cycle progresses, it’s becoming clearer this late cycle explosion of activity most closely mimics conditions during Solar Cycle 12. That one led into a period of low sunspot activity corresponding to a 0.3ºC decline in global air/sea temperatures in the late 1800s.
If the physical conditions inside the sun today are the same as Cycle 12 then earth could be headed into a mild cooling trend over the next 20+ years.
Cycle 24 sunspot progression
The Royal Observatory of Belgium released September’s monthly international sunspot numbers on October 1, 2014. Sunspots took a huge 13 spots/day leap last month.
As a result, solar maximum jumped again, too. September marks the eighth month in a row setting a new solar maximum. At 80.8, solar max is up over 80 for the first time this cycle. It’s still far below a normal 120 spots/day maximum, though. September’s monthly average went up to 87.6 spots/day.
The increase in solar activity was all in the sun’s busy southern hemisphere. Solar activity in the northern hemisphere peaked three years ago.
Cycle 24’s smoothed secondary peak became the largest ever with the newest released numbers.
Cycle 24 compared to Cycle 12
Early on, Cycle 24 was compared to Cycle 14. Some even compared it to Cycle 5 leading into the Dalton Minimum. However, with all the late cycle activity, Cycle 24 now most closely matches Cycle 12 that peaked in 1893.
These two cycles share these traits:
- Both were preceded by long extended minimums
- Both are exceptionally weak
- Both have singlet secondary peaks higher than their first
- Cycle 12 occurred at the beginning of a series of weak cycles
- Indications are Cycle 24 will be followed by a weaker Cycle 25
It’s noteworthy that just last month Cycle 24 replaced Cycle 12 for having the highest reliably determined peak-to-peak secondary maximum in the entire sunspot record.
Cycle 12 was the lead into a series of five weak sunspot cycles in the late 19th and early 20th centuries. That time frame was characterized by a 0.3°C decrease in earth’s global atmospheric temperature between 1880 and 1910.
Cycle 24 continues a trend of lower solar activity over the last three cycles. The IPCC (International Panel on Climate Change) in their latest AR5 report suggest low sunspot activity as one of the explanations for the current “hiatus” from global warming since 1998.
Looking less like a Dalton Minimum
This graph plots the three cycles leading into the Dalton Minimum (in blue), overlaid with the most recent three cycles (in red). The display is current through September 2014. Both sets of three cycles have shared similarities:
- They have two straight declining cycles
- The middle cycles have extended trailing minimums
- The third cycles have secondary peaks higher than their first
- The third cycles are exceptionally weak
However, two important differences affecting climate change have clarified over the last six months:
- The declining slope in cycle activity is somewhat less than the Dalton
- The current cycle is much stronger than its Dalton counterpart
These two differences combined imply that solar influence on climate, if any, will be less over the next 20+ years than it was during the Dalton (estimated at 0.8°C cooling).
September ended with a surprising late cycle leap in sunspot activity. Another new solar maximum record was set. Sunspot counts so far in October show there will be another new solar maximum set next month, too.
Ironically, it strengthens the case that the sun is headed into some sort of minimum activity phase.
The current cycle now looks much closer to Cycle 12 than Cycle 5, its Dalton counterpart. That supports the emerging idea that the next several cycles will be more like the 0.3°C cooling trend of the late 1800s than like the 0.8°C estimated cooling during the Dalton.
The earth climate system is highly complex. There are many intricately interrelated forcing factors that combine to produce climate change. Solar variability is just one of them. Other factors, like human CO2 emissions and El Niño, could counteract the sun’s impact. In fact, global cooling from 1946-1978 corresponds to a period of increasing solar sunspot activity.
Whether or not cooling comes to pass remains to be seen. Twenty five percent of all the earth’s recent atmospheric CO2 rise has accumulated in the last 15 years without any statistically significant atmospheric warming. It appears that human influence alone is not the soul controlling factor driving climate change, as once believed.
Solar activity is declining. Global warming has stopped. Perhaps that isn’t coincidence. If not, earth may experience a few tenths of a degree cooling over the next 20+ years.