####018000878#### AXXX82 KWNP 220031 DAYOBS :Product: Summary of Space Weather Observations dayobs.txt :Issued: 2026 Apr 22 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 21 # Region Location Sunspot Characteristics # Helio Spot Spot Mag. # Num Lat.,CMD Long. Area Extent class count class 4415 S18W99 15 60 2 HSX 1 A 4419 N15W37 313 250 12 EHO 14 BG 4420 N16E52 224 60 6 DAO 6 BG 4421 S09E72 204 50 9 CAO 3 B 4422 N09W30 306 20 3 CRO 5 B ####018002082#### FXXX10 KWNP 220031 DAYTDF :Product: 3-Day Forecast :Issued: 2026 Apr 22 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 5 (NOAA Scale G1). The greatest expected 3 hr Kp for Apr 22-Apr 24 2026 is 3.00 (below NOAA Scale levels). NOAA Kp index breakdown Apr 22-Apr 24 2026 Apr 22 Apr 23 Apr 24 00-03UT 2.67 2.33 2.33 03-06UT 2.00 2.00 2.67 06-09UT 2.33 2.00 2.67 09-12UT 2.00 2.00 1.67 12-15UT 2.00 0.67 1.33 15-18UT 2.33 2.00 2.00 18-21UT 2.00 2.67 2.00 21-00UT 2.00 3.00 2.33 Rationale: No G1 (Minor) or greater geomagnetic storms are expected as the ongoing CH HSS effects wane. 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 22-Apr 24 2026 Apr 22 Apr 23 Apr 24 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 Apr 22-Apr 24 2026 Apr 22 Apr 23 Apr 24 R1-R2 10% 10% 10% R3 or greater 1% 1% 1% Rationale: There is a slight chance for R1-R2 (Minor-Moderate) radio blackouts in the next three days. ####018003213#### FXXX12 KWNP 220031 DAYDIS :Product: Forecast Discussion :Issued: 2026 Apr 22 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 remained at low levels. The largest flare of the period was a C5.3 at 21/0602 UTC from Region 4421 (S09E72, Cao/beta). Region 4419 (N15W37, Eho/beta-gamma) showed minor decay, particularly in its trailing spots. Regions 4420 (N16E52, Dro/beta-gamma) and 4422 (N09W30, Cro/beta) were numbered during the period. Region 4420 was numbered and contributed the remaining C-class flares of the reporting period, due to its rapid flux emergence. A large filament lifted off north of center disk, starting at approximately 20/2350 UTC. The associated slow CME was first visible in LASCO C2 imagery beginning at approximately 21/0130 UTC and subsequently in STEREO and GOES CCOR. Modeling suggests that the CME will pass above Earths orbit, with the potential for very minor entanglement with an anticipated coronal hole high speed stream around 24 Apr. No other Earth directed CMEs were observed in coronagraph imagery. .Forecast... Solar activity is expected (75%) to be at low levels, with a slight chance (10%) for isolated M-class activity, on 22-24 Apr, primarily due to the flare potential from Region 4420 and limb activity. Energetic Particle .24 hr Summary... The greater than 2 MeV electron flux at geosynchronous orbit reached high levels with a maximum reading of 4,990 pfu at 21/1740 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 to high levels on 22-24 Apr. The greater than 10 MeV proton flux is expected to continue at background levels on 22-24 Apr. Solar Wind .24 hr Summary... Solar wind parameters reflected waning CH HSS influences. Total magnetic field (Bt) averaged ~5 nT after a max of 8 nT at the very beginning of the reporting period. The north-south component (Bz) was predominantly south/negative, with a sustained southward deflection of ~5 nT for the majority of the reporting period. The wind speed maintained an average ~525 km/s, and Phi was predominantly in a negative orientation (towards the Sun). .Forecast... Mildly enhanced solar wind conditions are anticipated 22-23 Apr as the negative polarity CH HSS continues to move from its geoeffective position, transitioning to elevated conditions on 24 Apr due to the anticipated arrival of a positive polarity CH HSS. Geospace .24 hr Summary... The geomagnetic field went from Quiet to G1 (Minor) storming levels due to sustained periods of negative Bz during the ongoing -CH HSS conditions. .Forecast... Mostly quiet to unsettled levels are expected 22-24 Apr, with isolated active conditions possible, due to diminishing negative polarity HSS effects and the anticipated arrival of a positive polarity HSS around 24 Apr.