Electron 2 MeV Integral Flux Alert issued on October 15

An Electron 2 MeV Integral Flux Alert was issued on October 15, 2025, after observed flux values exceeded the threshold of 1,000 pfu. The alert has been in effect since October 1, 2025, with a recent maximum flux of 5,134 pfu recorded yesterday.

According to NOAA SWPC, potential impacts include significant charging of satellite systems, which could result in increased risk to satellite systems. Operators are advised to remain vigilant for possible disruptions linked to elevated electron flux conditions.

Data from the latest forecast discussion confirms that the greater than 2 MeV electron flux reached high levels, with a value of 5,130 pfu observed on October 14 at 15:50 UTC. The proton flux remained at background levels. The forecast anticipates that electron levels will return to nominal to moderate on October 15–16, with a slight chance for elevated proton flux exceeding S1 – Minor levels through October 17.