A U.S. government agency said a weaker repeat of Saturday’s powerful solar storm was likely on Sunday.

The U.S. ´ºÉ«Ö±²¥ Oceanic and Atmospheric Administration said that “coronal mass ejections†— clouds of ejected solar plasma that can cause power grid irregularities and issues with high-frequency communications and global positioning systems — will slam into the Earth’s magnetic field and outer atmosphere until at least Sunday night.

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