геомагнитна буря (geomagnetic storm)

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A geomagnetic storm is a temporary disturbance of Earth's magnetosphere caused by solar wind, typically after a coronal mass ejection (CME) or fast solar wind streams from the Sun, which can disrupt satellites, power grids, and communications. When solar wind interacts with Earth's magnetic field, energy is transferred via magnetic reconnection, energizing particles and intensifying the ring current, often producing dazzling auroras at high latitudes and sometimes visible farther from the poles during strong events. In recent years, space weather monitoring and forecasting have improved, with real time alerts from agencies like NOAA's Space Weather Prediction Center and global magnetometer networks, while the solar cycle (Cycle 25) drives periods of higher activity and more CMEs. Notable facts include that geomagnetic storms are rated on a G1 to G5 scale; impacts can include satellite anomalies, GPS disruptions, radio blackouts, and, in extreme cases, geomagnetically induced currents that threaten transformers and power grids, with auroras visible during strong storms. For South Africa, geomagnetic storms are rarer, but global events can still affect satellites and communications in ZA, so staying informed via space weather alerts and relevant advisories is wise.

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