Electron 2 MeV Flux Alert issued on December 25

An Electron 2 MeV Integral Flux Alert was issued on December 25, 2025, by the NOAA Space Weather Prediction Center. The alert was triggered after electron flux levels exceeded 1,000 pfu, continuing a heightened period that began on December 21, 2025. Peak flux measured 7,351 pfu yesterday, indicating sustained high levels of energetic electrons in geospace.

Potential impacts from this elevated electron environment include significant charging of satellite systems, increasing the risk to satellite operations. High-energy electron events, such as this, can build up excess charge on spacecraft surfaces and internal components, which may lead to operational anomalies or more serious malfunctions.

The latest forecast discussion confirms that the greater than 2 MeV electron flux is expected to remain at high levels through December 27, 2025. The ongoing elevated flux is attributed to the continued influence of a positive polarity coronal hole high-speed stream (CH HSS), which is enhancing solar wind conditions around Earth. No Earth-directed coronal mass ejections were observed during the period.