Routine Space Environment Product (Daily)
Issued by NWS
Issued by NWS
627 FXXX12 KWNP 120031 DAYDIS :Product: Forecast Discussion :Issued: 2026 Sep 12 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 was very low with some weak B-class flare activity observed from Region 4521 (N09W81, Hsx/alpha) as it approaches the west limb. Region 4530 (N19W35, Dao/beta) showed some very minor areal growth, but was quiet. Region 4525 (N11W24, Cro/beta) observed slight decay in spot count and areal coverage. The remaining regions displayed no significant changes. No Earth-directed CMEs were observed in available coronagraph imagery. .Forecast... Solar activity is anticipated to remain low, with a slight chance of low-level M-class flares (R1-Minor) through 14 Sep. Energetic Particle .24 hr Summary... The greater than 2 MeV electron flux reached high levels with a maximum flux of 7,008 pfu observed at 11/1355 UTC. The greater than 10 MeV proton flux was at background levels. .Forecast... The greater than 2 MeV electron flux is expected to reach high levels on 12 Sep and decline to low to moderate on 13-14 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 5 nT, the Bz component varied between +/- 5 nT, and solar wind speed peaked at 455 km/s at 11/0121 UTC but averaged about 400 km/s through the period. The phi angle was predominantly positive until roughly 11/1530 UTC when it started to frequently oscillate between sectors. .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 through 14 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; there is the potential for active periods on 12 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. Unsettled to active levels are possible on 14 Sep due to -CH HSS influences.