Routine Space Environment Product (Daily)
Issued by NWS
Issued by NWS
161 FXXX12 KWNP 200031 DAYDIS :Product: Forecast Discussion :Issued: 2025 Jul 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 was at low levels with only C-class activity observed. The majority of the C-flare activity originated from Region 4136 (N21W62, Dkc/beta-gamma), which exhibited slight decay. New Regions 4149 (N17E70, Dso/beta) and 4150 (S15E65, Cao/beta) were numbered, and the remaining regions were mostly stable throughout the period. No Earth-directed CMEs were observed. .Forecast... Solar activity is expected to be low with a chance for M-class flares (R1-R2/Minor-Moderate) and a slight chance for an isolated X-class flare (R3-Strong) over 20-22 Jul. Energetic Particle .24 hr Summary... The greater than 2 MeV electron flux reached high levels with a peak flux of 11,582 pfu observed at 19/1715 UTC. The greater than 10 MeV proton flux was steady at background levels throughout the period. .Forecast... The greater than 2 MeV electron flux is expected to reach high levels on 20-22 Jul. There is a slight chance for the greater than 10 MeV proton flux to reach S1 (Minor) solar radiation storm levels through 22 Jul. Solar Wind .24 hr Summary... The solar wind environment remained weakly enhanced as positive polarity CH HSS influence waned. The total magnetic field strength reached 6 nT nT, with the Bz component reaching as far south as -4 nT. Solar wind speeds decreased from a peak of 575 km/s to around 450 km/s. Phi remained mostly positive throughout the period. .Forecast... Ambient solar wind conditions are expected to prevail over 20-22 Jul. Geospace .24 hr Summary... The geomagnetic field was at quiet levels under diminishing positive polarity CH HSS influence. .Forecast... Mostly quiet geomagnetic field conditions are expected to prevail over 20-22 Jul under ambient solar wind conditions.