Electron 2 MeV Integral Flux Alert issued on December 19
An Electron 2 MeV Integral Flux Alert was issued by NOAA SWPC on December 19, 2025, at 07:56 UTC, after the 2 MeV electron integral flux exceeded 1,000 pfu. The continued alert, identified as a continuation of Serial Number 3577, began at 14:05 UTC on December 17, 2025. The maximum 2 MeV electron flux recorded on December 18 reached 2,694 pfu.
Potential impacts of this elevated electron flux include significant charging of satellite systems, which could increase risks to satellites in affected orbits.
According to the latest forecast discussion, the greater than 2 MeV electron flux reached high levels due to high-speed solar wind stream influences and is expected to remain moderate to high through December 21, 2025.
For detailed, up-to-the-minute conditions, visit our real-time space weather monitoring platform at watchers.news/swx.