NOAA Warns of G4-Class Geomagnetic Storm: Potential Risks and Preparations

The National Oceanic and Atmospheric Administration (NOAA)'s Space Weather Prediction Center (SWPC) plans to hold a telephonic press conference on May 10th, local time, primarily to discuss an upcoming G4-class geomagnetic storm.

From May 8th to 9th, 2024, solar flares originating from the sun's 3664 region, accompanied by multiple coronal mass ejections (CMEs), were observed. These streams of high-energy particles are expected to merge and reach Earth on May 11th.

These high-energy particle streams, once deflected by Earth's magnetic field, will create dazzling auroras in high-latitude regions. However, geomagnetic storms can also impact human activities, mostly affecting wireless communications and, in severe cases, even the electrical grid infrastructure.

NOAA categorizes geomagnetic storms from G1 to G5, with G5 being the most severe. The SWPC has already issued a G4-class geomagnetic storm warning, prompting NOAA to organize the press conference to explain its potential impacts and advise operators of certain facilities to prepare.

Of particular concern is the potential impact of a G4-class storm on voltage control and electrical grid systems. The last G4-class warning was issued in 2015, aligning with the approximately 11-year cycle of solar activity. The peak of this solar activity cycle is expected to occur around 2025.

For aurora enthusiasts, the upcoming period presents an excellent opportunity to witness auroras in certain high-latitude regions. It's best to view from locations away from city lights to avoid light pollution and ensure the best viewing experience. Of course, it's also crucial to prepare for cold nights to stay warm.