Experts explain that the predicted 60% drop refers to the difference in amplitude between solar cycles. Photo credit: Kokoulina/Shutterstock
Research led by Professor Valentina Zharkova has raised alarm with predictions that solar activity could fall by as much as 60% during the decade from 2030 to 2040. According to her model, two magnetic waves inside the Sun, one in the deep convection zone, the other closer to the surface, are expected to become exactly out of sync during what is known as Solar Cycle 26.
This destructive interference could produce conditions similar to those during the Maunder Minimum, a period of very low sunspot activity associated with the Little Ice Age in the 17th century. The model, presented at a major astronomical meeting, is based on solar magnetic field observations combined with statistical analysis. Zharkova’s group claims their approach reaches a predictive accuracy of up to 97%.
What a “Mini Ice Age” Would Mean
Historical parallels and potential Earth‑climate impact
If Zharkova’s forecast holds, the world could see a sustained period of lower solar output reminiscent of the 17th-century Maunder Minimum, which coincided with unusually harsh winters in Europe and North America. Some media outlets have dubbed this scenario a “mini ice age.”
According to her team, the two magnetic waves will peak at the same time in opposite hemispheres of the Sun, almost canceling each other out. This, they argue, should sharply reduce sunspot numbers and weaken the Sun’s magnetic activity, a phenomenon they predict could last through the 2030s.
Scientific Skepticism and Climate Experts Weigh In
Not everyone agrees on the implications for Earth’s climate
Many climate scientists caution that even if solar activity does drop significantly, the effect on Earth’s climate may be relatively modest. A Grand Solar Minimum could slightly reduce solar irradiance, but not nearly enough to reverse or offset current global warming trends.
Experts explain that the predicted 60% drop refers to the difference in amplitude between solar cycles, not a 60% decrease in total solar output. This corresponds to a decline in solar brightness of only about 0.1%, which would have a limited cooling effect for a few decades at most.
The Debate: Is This Prediction Reliable?
Questions remain about the robustness of the double, dynamo model
While Zharkova’s double-dynamo theory offers a bold prediction, it has met with criticism in the scientific community. Independent analyses have challenged its long-term accuracy, arguing that the model may not accurately reproduce historical periods of solar inactivity.
Some researchers have called for a cautious interpretation: even if solar activity does drop, the resulting cooling would likely be minor compared to warming caused by greenhouse gas emissions. Any solar-induced cooling would likely be short-lived and dwarfed by ongoing human-driven warming.
Key Points
- A model forecasts up to a 60% drop in solar activity during 2030–2040.
- The predicted solar minimum could mimic conditions of the Maunder Minimum, a historical period dubbed a “mini ice age.”
- Despite headlines, scientists argue the climate impact would be modest: possibly only a small cooling effect lasting 20–30 years.
- Critics note the model’s predictions are uncertain and do not outweigh the dominant influence of greenhouse gases.
What Comes Next
Watching the Sun, and Earth’s climate, very closely
As Solar Cycle 25 peaks, researchers will closely monitor sunspot behaviour to test the theory. If the prediction proves correct, Cycle 26 could usher in a period of unusually weak solar activity.
However, the broader scientific consensus suggests that even a deep solar minimum will do little to halt global warming. For now, experts emphasise the continued importance of reducing greenhouse gas emissions, while also maintaining rigorous observations of the Sun’s magnetic cycles.
