A significant geomagnetic event, one of the longest magnetic storms of the current solar cycle, concluded in October 2025 after approximately four days. Sergey Bogachev, head of the Solar Activity Laboratory at the Space Research Institute of the Russian Academy of Sciences, reported that the storm ended as the main planetary index, Kp, returned to its normal range. The Kp index remained stable for about 17 hours, indicating a return to equilibrium.
The storm's intensity peaked above G3 level on the morning of September 30th, following a surge in solar activity that began on the evening of September 29th. The Earth's magnetic field experienced disturbances for roughly four days. Solar Cycle 25, which began in December 2019, has been more active than initially predicted, with sunspot numbers exceeding earlier forecasts. The peak of Solar Cycle 25 is anticipated around July 2025.
Geomagnetic storms can impact technologically dependent systems, including satellite operations, navigation systems, and radio communications. While direct health effects on humans are not scientifically established, the base article indicates that magnetic storms can affect the well-being of meteo-sensitive people, causing headaches, pressure drops, and general malaise. Infrastructure such as power grids and GPS systems can be vulnerable to rapid magnetic field variations. The increased activity in Solar Cycle 25 has led to more frequent powerful solar flares and coronal mass ejections, including events in May 2024 that caused significant geomagnetic storms and widespread aurora displays.
Scientists are continuously working to improve space weather forecasting and develop technologies to mitigate potential disruptions. Scientific works also indicate a possible correlation between periods of increased solar activity and changes in animal behavior, although these data require further confirmation. Scientists continue to study the impact of space weather on human health, especially on the cardiovascular system. Although current solar activity is showing a downward trend, the possibility of isolated strong solar flares and subsequent geomagnetic storms cannot be entirely ruled out, and these may last another 2-3 days. Experts advise staying informed about geomagnetic activity forecasts and taking precautionary measures during periods of heightened solar activity.