Routine Space Environment Product (Daily)
Issued by NWS
Issued by NWS
637 FXXX12 KWNP 180031 DAYDIS :Product: Forecast Discussion :Issued: 2026 Jul 18 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. Region 4490 (N15, L=202) decayed to plage, while Regions 4489 (S07E13, Cso/beta) and 4491 (S11E50, Hrx/alpha) remained stable. A few rudimentary spots emerged near S12E40, but this area remained unnumbered pending additional observations. No Earth-directed CMEs were observed in available coronagraph imagery. .Forecast... Solar activity is likely to reach low levels, with a slight chance for M-class flare activity, over 18-20 Jul. Energetic Particle .24 hr Summary... The greater than 2 MeV electron flux reached high levels with a peak flux of 1,990 pfu observed. 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 18-20 Jul. The greater than 10 MeV proton flux is expected to continue at background levels through 20 Jul. Solar Wind .24 hr Summary... The solar wind environment returned to background levels. Total magnetic field strength reached 5 nT, while the Bz component ranged between +/-4 nT. Solar wind speeds gradually decreased from ~430 km/s to ~350 km/s throughout the period. .Forecast... Solar wind parameters are expected to be mildly enhanced with weak positive polarity CH HSS influences on 18 Jul. Ambient conditions are expected to prevail on 19-20 Jul. Geospace .24 hr Summary... The geomagnetic field was quiet under an ambient solar wind environment. .Forecast... The geomagnetic field is expected to be quiet to unsettled on 18 Jul under weak positive polarity CH HSS influences. Mostly quiet conditions are expected to prevail on 19-20 Jul.