####018000762#### AXXX82 KWNP 180031 DAYOBS :Product: Summary of Space Weather Observations dayobs.txt :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 # https://www.swpc.noaa.gov/content/subscription-services # # Summary of Space Weather Observations # :Solar_Region_Summary: 2026 Jul 17 # Region Location Sunspot Characteristics # Helio Spot Spot Mag. # Num Lat.,CMD Long. Area Extent class count class 4482 S09W97 303 150 4 HSX 1 A 4489 S07E13 192 170 4 CSO 4 B 4491 S11E50 155 20 2 HRX 2 A ####018002052#### 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. ####018002127#### FXXX10 KWNP 180031 DAYTDF :Product: 3-Day Forecast :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 # # 3-Day Forecast # A. NOAA Geomagnetic Activity Observation and Forecast The greatest observed 3 hr Kp over the past 24 hours was 1 (below NOAA Scale levels). The greatest expected 3 hr Kp for Jul 18-Jul 20 2026 is 2.67 (below NOAA Scale levels). NOAA Kp index breakdown Jul 18-Jul 20 2026 Jul 18 Jul 19 Jul 20 00-03UT 1.67 1.67 1.33 03-06UT 2.00 2.00 1.33 06-09UT 2.67 1.67 1.33 09-12UT 2.00 1.33 1.33 12-15UT 1.67 0.67 1.67 15-18UT 1.00 0.67 1.67 18-21UT 1.00 1.67 1.67 21-00UT 2.00 1.67 1.33 Rationale: No G1 (Minor) or greater geomagnetic storms are expected. No significant transient or recurrent solar wind features are forecast. B. NOAA Solar Radiation Activity Observation and Forecast Solar radiation, as observed by NOAA GOES-18 over the past 24 hours, was below S-scale storm level thresholds. Solar Radiation Storm Forecast for Jul 18-Jul 20 2026 Jul 18 Jul 19 Jul 20 S1 or greater 1% 1% 1% Rationale: No S1 (Minor) or greater solar radiation storms are expected. No significant active region activity favorable for radiation storm production is forecast. C. NOAA Radio Blackout Activity and Forecast No radio blackouts were observed over the past 24 hours. Radio Blackout Forecast for Jul 18-Jul 20 2026 Jul 18 Jul 19 Jul 20 R1-R2 15% 15% 15% R3 or greater 1% 1% 1% Rationale: There remains a slight chance for R1-R2 (Minor-Moderate) radio blackouts over 18-20 Jul.