Massive Solar Flare Unleashes Strongest Radiation Storm Since 2017


On June 8, 2024, a significant solar event occurred as sunspot AR3697 erupted with a powerful M9.7-class solar flare. This event produced the strongest radiation storm Earth has experienced since September 2017, according to NOAA’s Space Weather Prediction Center (SWPC). Such events have notable impacts on space operations, satellite communications, and even ground-based technology.

The Solar Flare and Its Effects

The flare was classified as an M9.7, making it the second strongest type of solar flare. Solar flares are categorized into lettered groups based on their intensity, with X-class flares being the most powerful, followed by M, C, B, and A. The radiation storm from this flare was rated as strong (S3) on NOAA’s Space Weather Scale, which indicates significant potential for impact on satellites, space missions, and high-frequency radio communications.

Geomagnetic Storm and Radio Blackouts

Following the flare, a stream of energetic protons reached Earth, causing a polar cap absorption (PCA) event. This phenomenon disrupted shortwave radio signals in the northern polar region. The storm also triggered an enormous radio blackout, which affected parts of the sunlit side of Earth, impacting regions such as the Western U.S., the Pacific, Europe, Africa, and Asia. These disruptions can severely affect navigation systems, aviation communication, and other technologies reliant on high-frequency radio waves.

Coronal Mass Ejection (CME)

In addition to the flare, a coronal mass ejection (CME) was hurled towards Earth. CMEs are large expulsions of plasma and magnetic field from the Sun’s corona. The impact of this CME was expected to reach Earth’s atmosphere by June 10, potentially leading to geomagnetic storms. Such storms can enhance auroral displays, making them visible at lower latitudes than usual.

Implications for Mars Missions

The radiation storm’s impact extended beyond Earth. NASA’s Curiosity rover and other Mars missions detected significant radiation levels on the Martian surface. These findings underscore the challenges that solar storms pose for future manned missions to Mars. Shielding astronauts from such intense radiation will be crucial for their safety and the success of long-term space missions.


The solar flare and ensuing radiation storm of June 8, 2024, serve as a reminder of the dynamic and sometimes hazardous nature of our Sun. As we advance our technological capabilities and extend human presence into space, understanding and mitigating the effects of solar activity remains a critical aspect of space exploration.