Solar activity remained at low levels over the past 24 hours, with five numbered sunspot regions currently observed on the disk. Forecasters predict continued low solar activity, with a slight chance for M-class solar flares on May 20 and 21, and an increased chance on May 22.
The geomagnetic field experienced quiet to active levels during the reporting period, with solar wind speed peaking at 655 km/s. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 3917 pfu.
The geomagnetic field is expected to be quiet on May 20 and 22, with quiet to unsettled conditions anticipated for May 21. Probabilities for M-class flares are 20% for May 20, 20% for May 21, and 25% for May 22. High latitudes face a 25-35% chance of a minor geomagnetic storm and a 20-30% chance of a major-severe storm over the forecast period.