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The solar flare, a huge explosion on the sun's surface caused by magnetic activity, affected transmissions in southern China on Tuesday, Xinhua news agency has said, quoting the China Meteorological Administration.
The US space administration NASA said Monday's solar flare was the largest in four years, and the event sparked predictions of heightened northern hemisphere aurora activity.
Solar flares are the most powerful explosions in the solar system and the radiation they emit can trigger radio blackouts and other phenomena on Earth, NASA said.