Solar Cycle 25: The Sun is Heating Up

Solar Cycle 25 Predictions and Updates

March 4, 2021
Space Weather and Solar Flares
NASA

Solar Cycle 25 is heating up! Will this new solar cycle be a wild one or a washout? Learn more about predictions regarding the next solar cycle, sunspots, solar flares, and auroras!

The Old Farmer’s Almanac pays attention to solar science as it’s one of the disciplines employed in the making of our long-range weather predictions. Our founder, Robert B. Thomas, who started this almanac back in 1792, believed that weather on Earth was influenced by sunspots, which are magnetic storms on the surface of the Sun. See how The Old Farmer’s Almanac predicts the weather.

When Solar Cycle 25 Began

Solar Cycle 25 began in December 2019 and is expected to peak in 2025, according to the Solar Cycle 25 Prediction Panel, an international group of experts co-sponsored by NASA and NOAA.

Specifically, December 2019 was the “solar minimum” or period of least solar activity in the 11-year solar cycle of the Sun. What are solar cycles? Learn more here.

  • A solar cycle’s highs and lows are mainly tracked by “sunspots”—dark cool areas on the Sun’s surface. Learn more about sunspots.
  • Sunspots release solar energy and are associated with “solar flares” which are intense bursts of radiation observed near the Sun’s surface and in close proximity to a sunspot group.
  • Solar flares are sometimes accompanied by a coronal mass ejection (CME for short), which shoot actual matter (charged particles) into space. 
  • If the solar eruption is very intense, the radiation that it releases can interfere with our radio communications here on Earth. 

Solar Cycle 24 lasted 11 years (December 2008 to 2019), which is the average length of a cycle, though it was the weakest cycle in terms of solar activity in 100 years. “Solar maximum” or the peak of Cycle 24 was in April 2014 with sunspots peaking at 114, well below average of 179.

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Solar Cycle 25 Predictions

The start of a new Solar Cycle (25) means there wil be increasing activity and more sunspots until roughly mid-2025.

However, the long-range prediction is that Solar Cycle 25 will below average, quiet, and cool. This is very similar to the Cycle 24—the weakest since record-keeping began in 1755.

“According to NOAA/NASA and international experts: “Cycle 25 will be similar in size to Cycle 24, preceded by a long, deep minimum. Solar Cycle 25 may have a slow start, but is anticipated to peak with solar maximum occurring between 2023 and 2026, and a sunspot range of 95 to 130. This is well below the average number of sunspots, which typically ranges from 140 to 220 sunspots per solar cycle.”

  • Specifically, the experts predicted: a peak in July, 2025 (+/- 8 months), with a smoothed sunspot number (SSN) of 115.
  • The panel agreed that Cycle 25 will be average in intensity and similar to Cycle 24, and its peak will be similar as well.
  • Additionally, the panel concurred that solar minimum between Cycles 24 and 25 will occur in April, 2020 (+/- 6 months). 

Contrary to NOAA/NASA’s models, there have been more recent studies with models which suggest that Solar Cycle 25 could be one of the strongest since record-keeping began.

Time will tell. For now, we know the Sun will be heating up as it takes its journey towards its solar maximum. 

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Solar Cycle 24 Recap

Solar Cycle 24 was one of the quietest, weakest cycles in a century. (The prior cycle, 23, also had an extended period of very few sunspots.) For posterity, below is the very brief history of Cycle 24, which we were watching since it began in December of 2008—two years later than expected.

Spotless Days (through September 16, 2020)
2020 total: 181 days (70%)
2019 total: 281 days (77%)
2018 total: 221 days (61%)
2017 total: 104 days (28%)
2016 total: 32 days (9%)
2015 total: 0 days (0%)
2014 total: 1 day (<1%)
2013 total: 0 days (0%)
2012 total: 0 days (0%)
2011 total: 2 days (<1%)
2010 total: 51 days (14%)
2009 total: 260 days (71%)
2008 total: 268 days (73%)
2007 total: 152 days (42%)
2006 total: 70 days (19%)

Brief History and Highlights of Cycle 24

–In 2008Cycle 24 began (specifically on January 4).
–In 2011, sunspots started to build again. A monthly spike occurred in November 2011. 
–In 2012, the smoothed sunspot number reached a first peak of 98.3 (March, 2012).
–April 2014 brought a second peak. The smoothed sunspot number reached a second peak of 116.4 (April, 2014). This became the official maximum.  It’s not unusual to have a double peak, but it’s rare that the second peak is larger than the first. Cycle 24’s peak still ranks as the weakest since Cycle 14, which peaked in 1906.
From 2015 to 2017, sunspots kept dropping steadily from 0% spotless days in 2015 to 28% spotless days in 2017.
In 2018, 61% of the days were spotless! We went weeks at a time without a single spot on the Sun’s face. 
In 2019, even more days were spotless (77%), hitting rock bottom in December.
In 2020, sunspot counts were at their lowest at the start of year but started to pick up slowly.

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Image: The TIMED satellite monitoring the temperature of the upper atmosphere.

Prospects of a Mini Ice Age

What do inactive solar cycles mean in terms of climate and weather? Overall, quiet-to-average solar cycles with deep solar minimums mean a cooling pattern. In other words, temperatures become colder than they would have been otherwise. Sunspots are similar to a bathtub of lukewarm water; if you trickle in cold or hot water, it may take a while to notice the difference.

If this cooling phase on Earth, however, is offset by any warming caused by increasing greenhouse gases, it also raises the question of whether an eventual warming cycle could lead to more rapid warming on Earth than expected.

Could a deep, long-lasting solar minimum lead to extreme cold such as a mini ice age? In the 17th century, the 70-year Maunder Minimum brought a very cold period to the Earth.

  • According to solar radiation expert Judith Lean, PhD, of the Naval Research Laboratory, if we do have a “Maunder Minimum,” it would not be a return to the “Little Ice Age.”
  • She points to a current global surface temperature that’s about 1.8 degrees Fahrenheit warmer than at the time of the Maunder Minimum and says that a return to a Maunder Minimum phenomenon would lead to a cooling by only one-tenth of a degree C or 0.18 degree F.

Also, Lisa Upton, Ph.D., solar physicist with Space Systems Research Corp., states that “the expectation that Cycle 25 will be comparable in size to Cycle 24 means that the steady decline in solar cycle amplitude, seen from cycles 21 to 24, has come to an end and that there is no indication that we are currently approaching a Maunder-type minimum in solar activity.”

In other words, the occurrence of a new mini ice age is doubtful. 

Much of this is the normal ebb and flow of the Sun/Earth relationship, which can be stormy. That said, if the Sun goes through a more prolonged solar minimum, then Earth could experience a cooler period.

Auroras aka Northern Lights

With the Sun entering the more active phase of its solar cycle, solar energy will be increasing until the solar maximum.

The months near the spring (March) and fall (October) equinox are the most geomagnetically active of the year. Strong storms are more likely to erupt, boosting the potential for both possible disruptions with satellites, radio communication, and power systems, but also awesome displays of the bright auroras!  

Interested in seeing nature’s light show? Read more about the Northern Lights.

Learn More

Learn more about how solar activity affects the weather

Stay tuned for further updates! Want to learn more about weather and space? Pick up your copy of The Old Farmer’s Almanac!

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Reader Comments

Leave a Comment

Solar cycle

Thank you for an easily understood explanation.

Sun cycles

I wonder if some years we have "open" winters without much snow then in a few years we have snow up to our shoulders,, is result of the sun's cycles???

Solar Cycle 24

It seems odd to conclude that the earth should get even warmer as the current solar minimum ends. The fact is that sunspot activity is at a low right now and it would seem the logical conclusion would be a colder winter.