US issues geomagnetic storm alert for Dec. 3-4
The National Oceanic and Atmospheric Administration’s (NOAA) Space Weather Prediction Center on Monday classified the alert as G2, indicating "moderate" storm conditions. The warning follows the detection of a massive coronal mass ejection—an eruption of solar material from the Sun’s surface—observed early Monday after a strong solar flare, which peaked at 0249GMT, according to NASA.
The solar cloud is currently heading toward Earth and is expected to deliver "a glancing blow" to the planet’s magnetic field on Wednesday and Thursday. Officials said the storm is likely to cause "mainly manageable effects to some technological infrastructure." Temporary disturbances could occur in satellite operations, mobile communications, GPS signals, and radio transmissions, though serious technical failures are uncommon at this storm level.
Parts of Australia and Southeast Asia already reported brief interruptions in radio communications on Tuesday, general sources noted.
In addition to technical effects, the storm may produce visible auroras—northern lights—across northern US states from New York to Idaho and the upper Midwest. Normally confined to areas near the Arctic, these natural light displays can extend farther south during geomagnetic storms, creating colorful sky phenomena.
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