Forecast Discussion
Issued (UTC): 2025 Jun 28 00:30 UTC
Issued (local): Sat Jun 28 2025 00:30:00 GMT+0000 (Coordinated Universal Time)
Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
Solar Activity
Forecast
A chance for R1-R2 (Minor-Moderate) radio blackouts due to isolated M-class flare activity will persist through 30 June.
24h Summary
Solar activity was at low levels with weak C-class flares observed in Regions 4120 (N07W50, Dao/beta) and 4122 (N13E28, Dai/beta). Region 4117 (S14W60, Dso/beta) continued to exhibit overall decay. Slight leader spot growth was observed in both Regions 4120 and 4122. All other regions were quiet and stable. New Regions 4123 (S25E21, Axx/alpha), 4124 (S14E51, Bxo/beta) and 4125 (N21E76, Hsx/alpha) were numbered this period. No Earth-directed CMEs were observed in available coronagraph imagery.
Energetic Particle
Forecast
The greater than 2 MeV electron flux will likely reach high levels through 30 June due to CH HSS effects. The greater than 10 MeV proton flux is expected to continue at background levels through 30 June.
24h Summary
The greater than 2 MeV electron flux reached high levels at 27/1320 UTC when flux levels exceeded event threshold. As of this report, the peak flux reached 2,467 pfu at 27/1725 UTC. The greater than 10 MeV proton flux was at background levels.
Solar Wind
Forecast
An enhanced solar wind environment is expected to continue through 28 June under a negative polarity CH HSS regime before beginning to trend towards a more nominal environment on 29-30 June.
24h Summary
Solar wind parameters reflected negative polarity CH HSS influence. Total field began the period slightly enhanced to 6-7 nT before gradually subsiding to around 4 nT. The Bz component underwent several southward deflections reaching a maximum of -6 nT. Solar wind speeds averaged near 700-725 km/s. The Phi angle was in a predominantly negative solar sector.
GeoSpace
Forecast
Unsettled to active conditions are expected on 28 June as HSS effects begin to wane with a return to primarily quiet to unsettled levels anticipated for 29 June. Mostly quiet conditions are expected on 30 June.
24h Summary
The geomagnetic field was at unsettled to G1 (Minor) storm levels due to continued negative polarity CH HSS influence.