Routine Space Environment Product (Daily)
Issued by NWS
Issued by NWS
523 FXXX12 KWNP 201231 DAYDIS :Product: Forecast Discussion :Issued: 2025 Apr 20 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 at low levels with C-class activity observed. The largest event of the past 24 hours was a C8.3 at 20/1200 UTC from an area just beyond the SE limb. At the writing of this report, solar flux units were still increasing. Other activity included a C4.3 flare at 19/1628 UTC from Region 4065 (S29E32, Dao/beta). Region 4065 and Region 4063 (N04W42, Bxo/beta) were the only regions to exhibit growth. Only minor changes were observed in the remaining spotted active regions. No Earth-directed CMEs were observed in available coronagraph imagery. .Forecast... Solar activity is expected to be low with a chance of M-class flares (R1-R2, Minor-Moderate) over 20-22 Apr. Energetic Particles .24 hr Summary... The greater than 2 MeV electron flux was at normal to moderate levels and the greater than 10 MeV proton flux was at background levels. .Forecast... The greater than 2 MeV electron flux is like to be at normal to moderate levels over 20-22 Apr. The greater than 10 MeV proton flux is expected to continue at background levels. Solar Wind .24 hr Summary... Solar wind parameters were mildly enhanced. Total magnetic field strength was between 4-9 nT. The Bz component was primarily oriented southward through about 19/2320 UTC, with a maximum southward deflection of -8 nT at 19/2030 UTC. Bz then became variable at +/-5 nT thereafter. Solar wind speeds were between ~350-450 km/s. Phi angle was predominantly negative 19/2320 UTC and became positive after. .Forecast... Solar wind parameters are likely to continue at or near background levels over 20-21 Apr. An enhancement is likely on 22 Apr due to the anticipated onset of a recurrent positive polarity CH HSS. Geospace .24 hr Summary... The geomagnetic field was at unsettled to G1 (Minor) levels. .Forecast... The geomagnetic field is expected to range from quiet to active levels on 20-21 Apr. G1-G2 (Minor-Moderate) geomagnetic storm levels are likely on 22 Apr due to the anticipated onset of a positive polarity CH HSS.