Geomagnetic storms 13 December 2025

On December 13, 2025, the geomagnetic activity level, or kIndex, is reported at 4, indicating a moderate level of activity. This level is often categorized as a "quiet" level on the geomagnetic scale, which ranges from 0 to 9. Such activity is generally not severe and typically has minimal impact on technology, communication, and overall life on Earth. For weather-sensitive individuals, including those with certain health conditions or those who are particularly sensitive to atmospheric changes, a kIndex of 4 may cause mild effects, such as increased fatigue, headaches, or changes in mood. Those sensitive to geomagnetic fluctuations could also experience variations in sleep patterns or discomfort, although these effects are generally less pronounced compared to higher kIndex levels. Overall, while individuals may notice some subtle changes during periods of moderate geomagnetic activity, the impact is usually short-lived and can be managed with awareness and self-care strategies.