Routine Space Environment Product (Daily)
Issued by NWS
Issued by NWS
372 FXXX12 KWNP 111231 DAYDIS :Product: Forecast Discussion :Issued: 2026 Sep 11 1230 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 was low due to a single C-class flare, a C1.6/Sf at 10/1712 UTC, observed from Region 4524 (N12W34, Hsx/alpha). Otherwise, only B-level enhancements were observed during the period. Region 4530 (N19W28, Dao/beta) continued to exhibit weak, intermediate spot growth while Region 4525 (N11W17, Cro/beta) observed decay in overall spot count and areal coverage. The remaining regions displayed no significant changes. A slow moving CME was first observed in GOES CCOR2 imagery at ~10/1430 UTC propagating from the southwest limb. Though no obvious source location was identified, it is thought to be one of many possible small filaments that lifted off during the period. Analysis indicated no impact at Earth is likely with an anticipated trajectory well ahead of Earths orbit. .Forecast... Solar activity is anticipated to remain low, with a slight chance of low-level M-class flares (R1-Minor) 11-13 Sep. Energetic Particle .24 hr Summary... The greater than 2 MeV electron flux reached high levels with a maximum flux of 3,077 pfu observed at 10/1745 UTC. The greater than 10 MeV proton flux was at background values. .Forecast... The greater than 2 MeV electron flux is expected to reach high levels 11-12 Sep and decline to low to moderate on 13 Sep. The greater than 10 MeV proton flux is expected to remain at background levels. Solar Wind .24 hr Summary... Solar wind conditions were at near-background levels. Total field strength averaged around 6 nT, the Bz component varied between +/-4 nT, and solar wind speed was between 424-467 km/s The phi angle was predominantly positive throughout the period. .Forecast... Solar wind conditions are anticipated to experience minor disturbances due mainly to a small, positive polarity CH HSS anticipated to remain geoeffective through early 12 Sep. Negative CH HSS effects are anticipated to begin late on 13 Sep. Geospace .24 hr Summary... The geomagnetic field was at quiet to unsettled levels. .Forecast... The geomagnetic field is expected to be quiet to unsettled through 13 Sep. Active periods are possible on 11 Sep due to continued +CH HSS influence as well as late on 13 Sep with an anticipated SSBC ahead of a negative polarity coronal hole high speed stream.