Magnetic-storm definitions

A disturbance or fluctuation in the earth's magnetic field, associated with solar flares.
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A worldwide disturbance of the earth's magnetic field, caused by solar flares and sunspots.
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A disturbance or fluctuation in the Earth's outer magnetosphere, usually caused by streams of charged particles (plasma) given off by solar flares. The entry of large amounts of plasma into the upper atmosphere results in intense auroral displays and other magnetic phenomena in the polar regions of the Earth.
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