Forecaster summary - Issued 2019-05-31T00:14:32

Electron counts increased significantly on 30th May under an established high speed stream from negative coronal hole 19, with high levels of high energy flux (greater than 2MeV) through the diurnal cycle. These conditions are likely to persist through days 1 and 2 (31st May & 1st June), before counts slowly decrease through the rest of the period as the solar wind returns to slow-ambient levels. However, there is some uncertainty as to what influences any other small coronal holes may have during the period. 

The current forecast is for the corresponding electron fluence to rise above the active threshold on day 1, but show a decreasing trend to below threshold values into day 3 (2nd June) in response to anticipated decreasing flux levels.