The M9.4 flare on Oct. 23, 2013, was associated with a coronal mass ejections or CME, a solar phenomenon that can send billions of tons of particles into space that can reach Earth one to three days later. These particles cannot travel through the atmosphere to harm humans on Earth, but they can affect electronic systems in satellites and on the ground.
CMEs can cause a spaceweather phenomenon called a geomagnetic storm, which occurs when they connect with the outside of Earth’s magnetic envelope, the magnetosphere, for an extended period of time. In the past, geomagnetic st
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