Electron integral flux alert issued on October 12

An official alert has been issued after the integral flux of electrons with energies greater than 2 MeV exceeded 1,000 pfu, as observed on October 12, 2025. This ongoing alert highlights the elevated electron environment in near-Earth space, with the maximum flux recorded at 2,785 pfu on the previous day. The alert is a continuation from an event that began on October 1, 2025, at 13:25 UTC.

The main potential impact is that satellite systems may experience significant charging, resulting in increased risk to satellite operations and potential anomalies. The alert cautions satellite operators to monitor conditions closely.

Forecast discussions from the NOAA SWPC indicate the greater than 2 MeV electron flux is expected to persist at high levels on October 13 and 14, after returning to normal to moderate levels for the remainder of October 12. No significant solar flare or CME activity has been identified as the direct trigger for this alert.