Routine Space Environment Product (Daily)
Issued by NWS
Issued by NWS
183 FXXX12 KWNP 230031 DAYDIS :Product: Forecast Discussion :Issued: 2026 Sep 23 0030 UTC # Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center # Product description and SWPC contact on the Web # http://www.swpc.noaa.gov/wwire.html # # Forecast Discussion # Solar Activity .24 hr Summary... Solar activity continued at low levels. Region 4534 (N11W35, Dai/beta) produced a C2.4 flare at 22/1720 UTC, which was the largest flare of the period. Region 4536 (N03W13, Dsi/beta) continued to mature and produced a C2.0 flare at 22/0451 UTC. Region 4537 (N08W26, Dri/beta-delta) showed signs of evolution as it increased slightly in magnetic complexity. Regions 4539 (S09E26, Cro/beta) and 4540 (S12W52, Bxo/beta) were numbered this period, but were relatively quiet. No Earth-directed CMEs were observed in available coronagraph imagery. .Forecast... Solar activity is likely to continue at low levels with isolated to occasional C-class flare activity, along with a slight chance for R1-R2 (Minor-Moderate) M-class flare events, through 25 Sep. 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 remained steady at background levels. .Forecast... The greater than 2 MeV electron flux is expected to continue at normal to moderate levels through 24 Sep, with a chance for a return to high levels by 25 Sep. The greater than 10 MeV proton flux is expected to persist at background levels through 25 Sep. Solar Wind .24 hr Summary... Solar wind parameters reflected a ambient, slow-wind regime. Total field values primarily ranged 3-4 nT and the Bz component was +/- 3 nT. Solar wind speeds underwent a gradual decrease, ending the period under 300 km/s. Phi was predominantly negative. .Forecast... A disturbed solar wind environment is expected to arrive by late on 23 Sep with a sector boundary crossing, followed by positive polarity coronal hole high-speed stream (+CH HSS) influences continuing through 25 Sep. Geospace .24 hr Summary... The geomagnetic field was quiet throughout the reporting period. .Forecast... Mostly quiet geomagnetic field conditions are expected through early 23 Sep. Unsettled to active levels are expected late on 23 Sep under early +CH HSS effects. Isolated periods of G1 (Minor) geomagnetic storming is likely on 24 Sep as +CH HSS influences strengthen. Isolated active levels are likely to persist into 25 Sep.