####018002330#### FXXX12 KWNP 100031 DAYDIS :Product: Forecast Discussion :Issued: 2026 Apr 10 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 moderate levels. Region 4409 (N01W85, Esi/beta-delta) produced an M1.0/Sf (R1-Minor) flare at 09/0845 UTC, the strongest of the period. No growth was observed in any of the numbered active regions over the past 24 hours. No Earth-directed CMEs were observed in available coronagraph imagery. .Forecast... Solar activity is expected to be at low levels 10-12 Apr, with a chance for M-class (R1-R2/Minor-Moderate) flares on 10 Apr. Energetic Particle .24 hr Summary... The greater than 2 MeV electron flux was at high levels with a peak flux of 10,679 pfu at 09/1605 UTC. The greater than 10 MeV proton flux was at background levels. .Forecast... The greater than 2 MeV electron flux is expected to be at moderate levels over 10-12 Apr due to the anticipated arrival of a corotating interacting region (CIR) ahead of a positive polarity coronal hole high speed stream (+CH HSS). The greater than 10 MeV proton flux is expected to remain at background levels. Solar Wind .24 hr Summary... Solar wind parameters were near nominal levels, with a small enhancement to the IMF observed after 09/1100 UTC. Total magnetic field strength gradually increased from ~5 nT to a peak of 10 nT late in the UT day. Bz was observed as far south as -8 nT. Solar wind speeds were mostly below 400 km/s, with the exception of a brief increase to ~420 km/s around 09/1100 UTC. Phi angle was variable, but predominantly in a negative orientation. .Forecast... Enhancements in solar wind parameters are likely over 10-12 Apr due to the anticipated influence of a CIR and the subsequent onset of a +CH HSS. Geospace .24 hr Summary... The geomagnetic field was at quiet levels. .Forecast... The geomagnetic field is likely to reach G1 (Minor) storm levels over 10-11 Apr due to the influence of a +CH HSS. Active conditions are likely on 12 Apr as the HSS gradually wanes. ####018002117#### FXXX10 KWNP 100031 DAYTDF :Product: 3-Day Forecast :Issued: 2026 Apr 10 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 2 (below NOAA Scale levels). The greatest expected 3 hr Kp for Apr 10-Apr 12 2026 is 5.33 (NOAA Scale G1). NOAA Kp index breakdown Apr 10-Apr 12 2026 Apr 10 Apr 11 Apr 12 00-03UT 3.33 5.33 (G1) 4.33 03-06UT 5.00 (G1) 4.00 3.67 06-09UT 4.33 4.00 2.67 09-12UT 3.67 3.33 2.33 12-15UT 2.67 3.67 3.00 15-18UT 2.67 4.00 2.33 18-21UT 2.67 4.67 (G1) 3.00 21-00UT 4.33 4.67 (G1) 3.33 Rationale: G1 (Minor) storm levels are likely over 10-11 Apr due to the influence of a +CH HSS. 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 Apr 10-Apr 12 2026 Apr 10 Apr 11 Apr 12 S1 or greater 5% 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 Radio blackouts reaching the R1 levels were observed over the past 24 hours. The largest was at Apr 09 2026 0845 UTC. Radio Blackout Forecast for Apr 10-Apr 12 2026 Apr 10 Apr 11 Apr 12 R1-R2 25% 5% 5% R3 or greater 1% 1% 1% Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts on 10 Apr. ####018000994#### AXXX82 KWNP 100031 DAYOBS :Product: Summary of Space Weather Observations dayobs.txt :Issued: 2026 Apr 10 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 Apr 09 # Region Location Sunspot Characteristics # Helio Spot Spot Mag. # Num Lat.,CMD Long. Area Extent class count class 4405 S28W99 174 100 17 HSX 1 A 4406 N07W0* 184 30 2 HRX 1 A 4408 N08W81 156 30 2 HSX 1 A 4409 N01W85 160 170 11 ESI 20 BD 4413 N07W90 165 20 3 CRI 4 B 4414 N15E50 25 30 5 CRI 3 B 4415 S18E60 14 80 2 HSX 1 A