Electron flux alert issued on June 9, 2026

An alert for elevated electron flux levels was issued on June 9, 2026, after the 2 MeV integral flux at geosynchronous orbit exceeded 1,000 pfu. The alert continues from June 7, 2026, at 11:43 UTC, with the previous maximum daily flux reported at 1,315 pfu.

The electron flux levels above 1,000 pfu at 2 MeV indicate heightened energetic particle activity in Earth’s outer radiation belt. Such levels may pose a minor risk to satellite operations, particularly to spacecraft in geosynchronous orbit, due to increased charging and potential surface anomalies. No significant increases in proton flux were detected, and all conditions remain within expected parameters of an electron flux alert.

Recent forecast discussions indicate that the greater than 2 MeV electron flux at geosynchronous orbit is expected to stay at high levels through June 10 before gradually returning to moderate or low levels by June 11, 2026. The trigger appears to be related to changes in the solar wind, including a glancing blow from a coronal mass ejection (CME) that passed near Earth on June 8. No new Earth-directed CMEs have been detected, and solar activity otherwise remains at low levels.