Solar Activity Alerts

:Product: Forecast Discussion :Issued: 2026 Jun 21 1230 UTC # Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center # Solar Activity .24 hr Summary... Solar activity reached moderate levels. Region 4473 (S08E63, Eao/beta) produced most of the flare activity this period, including an M2.6 flare (R1-Minor) at 21/0246 UTC; the strongest of the period. Regions 4472 (S14E49, Dao/beta) and 4473 underwent minor development, while the remaining regions were in decay. No Earth-directed CMEs were detected in available coronagraph imagery. .Forecast... Solar activity is expected to continue at predominately low levels on 21-23 Jun, with a chance for M-class (R1-R2/Minor-Moderate) flares. Energetic Particle .24 hr Summary... The greater than 2 MeV electron flux was at normal to moderate levels. The greater than 10 MeV proton flux was at background levels. .Forecast... The greater than 2 MeV electron flux is expected to continue at normal to moderate levels over 21-23 Jun. The greater than 10 MeV proton flux is expected to persist at background levels through 23 Jun. Solar Wind .24 hr Summary... Solar wind parameters returned to background levels this period. Total magnetic field strength reached 7 nT, and the Bz component ranged between +/-5 nT. Solar wind speeds were steady between 350-400 km/s, and the phi angle was predominately positive throughout the period. .Forecast... Background solar wind conditions are expected to prevail over 21-22 Jun. Enhanced conditions are expected on 23 Jun due to the anticipated onset of negative polarity CH HSS influences. Geospace .24 hr Summary... The geomagnetic field was at quiet levels. .Forecast... The geomagnetic field is expected to continue at mostly quiet levels over 21-22 Jun. Periods of active conditions are likely on 23 Jun due to the anticipated onset of negative polarity CH HSS influences.