Forecaster summary - Issued 2018-09-21T00:36:09

The High Energy (>2MeV) electron flux at GEO has persisted at high levels (above 1000 pfu) through the past 24 hours.  However, the flux may reduce sharply from day 3 (23rd) with the onset of the next coronal hole high speed stream and resulting geomagnetic activity. The corresponding 24-hour fluence values are also likely to remain above the High threshold (1e8 particles cm^-2 sr^-1 day^-1) for much of the forecast period, probably reducing during day 3 (23rd) and falling below the High threshold by day 4 (24th).