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Definition:
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One of the most common forms of space weather, a geomagnetic storm refers to any time Earth's magnetic environment, the magnetosphere, undergoes sudden and repeated change. Geomagnetic storms can be caused by high-speed blasts of the solar wind and when a CME connects up with the magnetosphere. The sun's magnetic fields peel back the outermost layers of Earth's fields changing the very shape of the magnetosphere. Magnetic storms have measurable effects worldwide, such as radio communication blackouts and power grid failures.
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