Why tonight’s massive solar storm could disrupt communications and GPS systems | CNN Business

Washington CNN  — 

Buckle up: An unusual amount of solar activity this week could disrupt some of the most important technologies society relies on.

On Thursday, the US government issued its first severe geomagnetic storm watch in nearly 20 years, advising the public of “at least five earth-directed coronal mass ejections” as well as sunspots covering an area 16 times wider than the earth itself. A severe geomagnetic storm, or G4, is the second-highest grade in the US government’s classification system.

Radiation from this activity will begin to hit Earth’s magnetic field on Friday and last through

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