A Forbush decrease is a phenomenon observed in cosmic ray flux, characterized by a sudden and temporary drop in the intensity of cosmic rays, which are high-energy particles originating from outer space. This decrease is typically associated with the interplanetary effects of solar activity, particularly during solar flares or coronal mass ejections (CMEs). When a solar storm occurs, it can produce a magnetic field that interacts with the Earth's magnetic field, effectively shielding the planet from incoming cosmic rays.
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