Forecaster summary - Issued 2025-12-27T00:43:31

There are no signs of likely mechanisms to reduce electron counts at GEO in the period as geomagnetism from the current fast wind wanes, and Active fluence is therefore Expected throughout. The diurnal oscillation in electron flux has risen day on day into the Christmas period, and this will most likely continue. There is therefore an sustained risk of persistent periods of High and a chance of Very High.

MOSWOC REFM and persistence both show an extended period of Active high energy electron fluence. The REFM recurrence is deemed the most likely version of events, with a Slight Chance of Very Active (1e9) fluence levels, as solar wind pressure gradually eases through the period.