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‘Significant solar flare’ prompts G3 Geomagnetic Storm Watch, NOAA says
National Oceanic and Atmospheric Administration (NOAA). The solar flare was categorized as an X1.0-class flare, according to NASA. "X-class denotes the most intense flares, while the number provides more information about its strength. An X2 is twice as intense as an X1, an X3 is three times as intense, etc.