Routine Space Environment Product (Daily)
Issued by NWS
Issued by NWS
232 FXXX12 KWNP 210031 DAYDIS :Product: Forecast Discussion :Issued: 2026 Sep 21 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 reached low levels with a C1.1 flare at 20/0518 UTC from new Region 4535 (N12E73, Hrx/alpha), and a C3.7/1f flare at 20/2234 UTC from Region 4534 (N11W08, Dro/beta). Regions 4532 (S06W54, Bxo/beta) and 4534 exhibited minor growth this period while the remaining regions were stable. No Earth-directed CMEs were detected in available coronagraph imagery. .Forecast... Solar activity is expected to be at very low levels on 21-23 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 was steady at background levels. .Forecast... The greater than 2 MeV electron flux is expected to continue at normal to moderate levels on 21-23 Sep. The greater than 10 MeV proton flux is expected to continue at background levels through 23 Sep. Solar Wind .24 hr Summary... The solar wind environment remained undisturbed over the past 24 hours. Total magnetic field strength averaged around 5 nT, and the north-south (Bz) component varied between +3/-4 nT. Solar wind speeds gradually decreased from a peak of around 430 km/s to 370 km/s by the end of the reporting period. The phi angle was predominately negative throughout the day. .Forecast... Ambient solar wind conditions are expected to prevail over 21-23 Sep. Geospace .24 hr Summary... The geomagnetic field was at quiet to unsettled levels. .Forecast... Mostly quiet geomagnetic field conditions are expected to prevail over 21-23 Sep.