Geomagnetic storms today

On Sunday, September 21, 2025, a kIndex level of 4 indicates a moderate level of geomagnetic activity, typically classified as "quiet." This level arises from a combination of solar wind and magnetic field interactions with the Earth's magnetosphere. While not indicative of severe geomagnetic storms, a kIndex of 4 can still influence the upper atmosphere and deliver subtle effects on satellite operations and radio communications, particularly in polar regions. For weather-sensitive individuals, this level of geomagnetic activity may lead to mild fluctuations in mood and sleep patterns. Some studies suggest that geomagnetic activity can affect human physiology, potentially exacerbating conditions such as migraines or anxiety in susceptible populations. While the effects are generally not severe at this level, those who are sensitive to environmental changes might notice small adjustments in their well-being. It is advisable for such individuals to remain aware of these potential impacts, while recognizing that this specific kIndex level signifies a relatively low level of risk in terms of geomagnetic interference.