Routine Space Environment Product (Daily)
Issued by NWS
Issued by NWS
492 FXXX12 KWNP 200031 DAYDIS :Product: Forecast Discussion :Issued: 2025 Apr 20 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 moderate levels. The largest event of the past 24 hours was the decay phase of an M4.4 flare at 18/2350 UTC from a source just beyond the SE limb. Region 4065 (S30E36, Dso/beta) and Region 4063 (N05W35, 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, with a maximum southward deflection of -8 nT at 19/2030 UTC. Solar wind speeds were between ~350-400 km/s. Phi angle was predominantly negative. .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 active 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.