SCIENCE & NATURE

What solar flares did NOAA observe and what impact did they have on Earth?

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NOAA observed two powerful X2.5 solar flares from sunspot region AR4419 that triggered strong radio blackouts affecting the Pacific Ocean, Australia, and East Asia.

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Flare ClassificationTwo X2.5 solar flares, the strongest observed in 78 days
TimingFirst peaked at 9:07 p.m. EDT on April 23, second at 4:14 a.m. EDT on April 24
SourceSunspot region AR4419 on the sun's western limb
Primary Impact on EarthStrong radio blackouts on the sunlit side of Earth
Affected RegionsPacific Ocean and Australia from first flare; East Asia from second flare
Accompanying ActivityLikely accompanied by coronal mass ejections, though direct Earth impact unlikely due to western limb position

The Solar Flares Observed

NOAA observed two X2.5 solar flares erupting from sunspot region AR4419 on the sun's western limb within 7 hours of each other. The first flare peaked at 9:07 p.m. EDT on April 23, 2026, and the second at 4:14 a.m. EDT on April 24. These were the strongest solar flares detected in 78 days. The flares originated just northwest of active Region 4419 and were preceded by multiple M-class solar flares and a rare sympathetic flare involving two separate sunspot regions.

Radio Blackouts on Earth

The bursts of radiation from both X-flares triggered strong radio blackouts on the dayside of Earth. When radiation from solar flares reaches Earth, it ionizes the ionosphere, disrupting shortwave radio communications. The ionization causes the lower atmospheric layers to become denser than usual, making radio waves more likely to collide with charged particles and lose energy. The first X-flare affected radio communications over parts of the Pacific Ocean and Australia, while the second impacted East Asia.

Potential for Geomagnetic Storms

The X-flares were accompanied by coronal mass ejections involving large expulsions of plasma and magnetic field from the sun. Because the sunspot region was positioned on the sun's western edge, direct Earth impact was considered unlikely. However, forecasters were modeling the CME paths, and a glancing blow remained possible. If such an impact occurred, it could trigger geomagnetic storm conditions and spark vivid aurora displays.

Sources

  1. X2.5 flare (R3-Strong) observed from near NW solar limb. (swpc.noaa.gov)
  2. Sun unleashes 2 colossal X-flares within 7 hours of each other, knocking out radio signals on Earth (space.com)
  3. Sun Releases 2 Strong Solar Flares (science.nasa.gov)

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