Solar flares are huge explosions in the atmosphere of the sun, caused by the sudden release of magnetic energy that gets built up in the sun's constantly moving magnetic fields. These explosions can accelerate solar particles to almost the speed of light.
Light and radiation from solar flares can reach Earth in minutes, but CMEs tend to travel a lot more slowly, sometimes taking three days to reach us. Both can cause navigation and communication disruption.
GPS等にも影響があるかもということでしたが、ニュースになるような大過はなかったようで。
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