A substantial time-dependent disturbance of the geomagnetic field driven by space-weather conditions. Rapid irregular changes can degrade a magnetic survey even after base correction.
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A geomagnetic storm is a temporary disturbance of the Earth's magnetosphere caused by a variety of solar activities, such as solar flares or coronal mass ejections (CMEs). When these solar phenomena eject significant amounts of plasma and magnetic fields into space, they can interact with the Earth’s magnetic field, leading to fluctuations in geomagnetic activity.