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geomagnetic storm
A worldwide disturbance of Earth’s magnetic field that follows 2 to 3 days after violent activity on the Sun, such as solar flares or coronal mass ejections. A geomagnetic storm's main phase, which can last as long as 2 to 2 1/2 days in the case of a severe storm, is characterized by multiple intense substorms with attendant auroral and geomagnetic effects.
Related category
• ATMOSPHERIC PHENOMENA AND STRUCTURES
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