The Earth was hit by the strongest solar radiation storm seen since October 2003. The event raised concerns due to its potential effects on satellite systems, communication infrastructure, and astronaut safety.
On Monday, Earth was exposed to the strongest solar radiation storm seen since October 2003. The event raised concerns due to its potential effects on satellite systems, communication infrastructure, and astronaut safety.
The Space Weather Prediction Center (SWPC) of the U.S. National Weather Service classified the event as an S4 (severe) solar radiation storm, the fourth level on a five-level scale. In a statement on social media, SWPC noted that this was the largest solar radiation storm in the last 20 years, with an S4 level last observed in October 2003.
The storm began on January 18 with a powerful X1.9-class solar flare erupting from the sunspot region named AR4341. This flare caused a full-halo coronal mass ejection (CME) directed straight at Earth. The CME traveled much faster than expected, reaching Earth from the Sun in only about 25 hours. Normally, this journey takes two to four days.
Magnetic Energy in Space Increased 20-fold
The impact of the CME was confirmed on January 19, and magnetic conditions escalated to a G4 (severe) geomagnetic storm level. SWPC forecaster Shawn Dahl stated that the magnetic energy in space increased to nearly 20 times its normal background level.
SWPC informed airlines, NASA, the Federal Aviation Administration (FAA), the Emergency Management Agency (FEMA), and the North American Electric Reliability Corporation about potential disruptions. Dahl said they are in constant communication with relevant agencies to ensure critical technological infrastructures can take timely precautions.
At high altitudes, the radiation risk has increased, especially for astronauts on the International Space Station and passengers on flights passing through polar regions. In such situations, astronauts can move to more protected sections of the station. This method has been applied in previous solar storms.
For satellite operators, risks are elevated, particularly for satellites in geostationary orbit, while GPS accuracy and high-frequency radio communication in polar regions may experience temporary disruptions. However, according to solar physicist Ryan French from the University of Colorado, widespread technological problems affecting the general public are not expected.
Northern Lights Reached Mid-Latitudes
The geomagnetic storm caused the northern lights to extend to lower latitudes where they are not normally seen. According to NOAA forecasts, if the storms continue, auroras could be visible in more than 24 states in the U.S., even as far south as Alabama and Northern California. Following the CME's arrival at Earth, northern light observations were also reported from many countries in Europe, including the Netherlands and Germany.
Space weather experts warn that new flares may occur from the active sunspot region in the coming days, and additional Earth-directed storms are possible.
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