Sun Hits Peak Phase in 11-Year Solar Cycle, Say NASA/NOAA

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In a teleconference with reporters on Tuesday, representatives from NASA, the National Oceanic and Atmospheric Administration (NOAA), and the international Solar Cycle Prediction Panel announced that the Sun has reached its solar maximum period, which could continue for the next year.

The solar cycle is a natural cycle the Sun goes through as it transitions between low and high magnetic activity. Roughly every 11 years, at the height of the solar cycle, the Sun's magnetic poles flip - on Earth, that'd be like the North and South poles swapping places every decade - and the Sun transitions from being calm to an active and stormy state.

On the left, an image of the Sun, shown in yellow and orange. It appears bare and is labeled Solar Minimum. On the right, another image of the Sun is covered in sunspots, which look like freckles. It's labeled Solar Maximum. — Visible light images from NASA's Solar Dynamics Observatory highlight the appearance of the Sun at solar minimum (left, Dec. 2019) versus solar maximum (right, May 2024). During solar minimum, the Sun is often spotless. Sunspots are associated with solar activity and are used to track solar cycle progress.
For these images and more relating to solar maximum, visit https://svs.gsfc.nasa.gov/14683.

NASA/SDO

On the left, the Sun shown in gold. It's fairly uniform and labeled Solar Minimum. On the right, the Sun in gold has several bright active regions. It's labeled Solar Maximum. — Images from NASA's Solar Dynamics Observatory highlight the appearance of the Sun at solar minimum (left, December 2019) versus solar maximum (right, May 2024). These images are in the 171-angstrom wavelength of extreme ultraviolet light, which reveals the active regions on the Sun that are more common during solar maximum.
For these images and more relating to solar maximum, visit https://svs.gsfc.nasa.gov/14683.

NASA/SDO

NASA and NOAA track sunspots to determine and predict the progress of the solar cycle - and ultimately, solar activity. Sunspots are cooler regions on the Sun caused by a concentration of magnetic field lines. Sunspots are the visible component of active regions, areas of intense and complex magnetic fields on the Sun that are the source of solar eruptions.

"During solar maximum, the number of sunspots, and therefore, the amount of solar activity, increases," said Jamie Favors, director, Space Weather Program at NASA Headquarters in Washington. "This increase in activity provides an exciting opportunity to learn about our closest star - but also causes real effects at Earth and throughout our solar system."

The solar cycle is the natural cycle of the Sun as it transitions between low and high activity. During the most active part of the cycle, known as solar maximum, the Sun can unleash immense explosions of light, energy, and solar radiation - all of which create conditions known as space weather. Space weather can affect satellites and astronauts in space, as well as communications systems - such as radio and GPS - and power grids on Earth.

Credits: Beth Anthony/NASA

Solar activity strongly influences conditions in space known as space weather. This can affect satellites and astronauts in space, as well as communications and navigation systems - such as radio and GPS - and power grids on Earth. When the Sun is most active, space weather events become more frequent. Solar activity has led to increased aurora visibility and impacts on satellites and infrastructure in recent months.

During May 2024, a barrage of large solar flares and coronal mass ejections (CMEs) launched clouds of charged particles and magnetic fields toward Earth, creating the strongest geomagnetic storm at Earth in two decades - and possibly among the strongest displays of auroras on record in the past 500 years.

May 3-May 9, 2024, NASA's Solar Dynamics Observatory observed 82 notable solar flares. The flares came mainly from two active regions on the Sun called AR 13663 and AR 13664. This video highlights all flares classified at M5 or higher with nine categorized as X-class solar flares.

Credit: NASA

"This announcement doesn't mean that this is the peak of solar activity we'll see this solar cycle," said Elsayed Talaat, director of space weather operations at NOAA. "While the Sun has reached the solar maximum period, the month that solar activity peaks on the Sun will not be identified for months or years."

Scientists will not be able to determine the exact peak of this solar maximum period for many months because it's only identifiable after they've tracked a consistent decline in solar activity after that peak. However, scientists have identified that the last two years on the Sun have been part of this active phase of the solar cycle, due to the consistently high number of sunspots during this period. Scientists anticipate that the maximum phase will last another year or so before the Sun enters the declining phase, which leads back to solar minimum. Since 1989, the Solar Cycle Prediction Panel - an international panel of experts sponsored by NASA and NOAA - has worked together to make their prediction for the next solar cycle.

Solar cycles have been tracked by astronomers since Galileo first observed sunspots in the 1600s. Each solar cycle is different - some cycles peak for larger and shorter amounts of time, and others have smaller peaks that last longer.

Sunspot number over the previous 24 solar cycles. Scientists use sunspots to track solar cycle progress; the dark spots are associated with solar activity, often as the origins for giant explosions - such as solar flares or coronal mass ejections - which can spew light, energy, and solar material out into space.

For these images and more relating to solar maximum, visit https://svs.gsfc.nasa.gov/14683.

NOAA's Space Weather Prediction Center

"Solar Cycle 25 sunspot activity has slightly exceeded expectations," said Lisa Upton, co-chair of the Solar Cycle Prediction Panel and lead scientist at Southwest Research Institute in San Antonio, Texas. "However, despite seeing a few large storms, they aren't larger than what we might expect during the maximum phase of the cycle."

The most powerful flare of the solar cycle so far was an X9.0 on Oct. 3

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