####018002115#### FXXX10 KWNP 280031 DAYTDF :Product: 3-Day Forecast :Issued: 2026 Mar 28 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 Mar 28-Mar 30 2026 is 4.00 (below NOAA Scale levels). NOAA Kp index breakdown Mar 28-Mar 30 2026 Mar 28 Mar 29 Mar 30 00-03UT 1.67 2.33 3.67 03-06UT 2.00 1.67 4.00 06-09UT 1.33 1.00 3.00 09-12UT 0.67 0.67 2.33 12-15UT 1.33 1.67 2.00 15-18UT 1.33 2.33 2.33 18-21UT 1.67 2.67 3.00 21-00UT 1.67 3.00 3.00 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 Mar 28-Mar 30 2026 Mar 28 Mar 29 Mar 30 S1 or greater 5% 5% 5% 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 Mar 28-Mar 30 2026 Mar 28 Mar 29 Mar 30 R1-R2 45% 45% 40% R3 or greater 5% 5% 5% Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts over 28-30 Mar. ####018002645#### FXXX12 KWNP 280031 DAYDIS :Product: Forecast Discussion :Issued: 2026 Mar 28 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 4401 (N25W02, Ekc/beta-gamma) exhibited signs of evolution as it gained maturing penumbra in its intermediate area while maintaining a mixed polarity configuration. Newly numbered Region 4405 (S25E66, Eho/beta) was the main culprit for C-class flare activity during the period producing a C5.4 flare at 27/1002 UTC, which was the largest of the period. A CME originating from the vicinity of AR 4405 was observed in LASCO C2 imagery near the beginning of the 27 Mar UTC-day. This event was modeled and determined to be a miss well behind Earths orbit. Additional activity included a potentially disappearing filament centered near S28E23, but it is unclear as of the time of this writing if it resulted in an eruption. No Earth-directed CMEs were observed in available coronagraph imagery. .Forecast... Solar activity is expected to be low with a chance for M-class (R1-R2/Minor-Moderate) flares through 30 Mar. Energetic Particle .24 hr Summary... Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 12,784 pfu. The greater than 10 MeV proton flux remained at background levels. .Forecast... The greater than 2 MeV electron flux is expected to continue to reach high levels through 30 Mar. The greater than 10 MeV proton flux is expected to continue at background levels. Solar Wind .24 hr Summary... Solar wind parameters reflected a return to an ambient-like environment. Solar wind speed reached a peak near 477 km/s before decreasing to near 400 km/s. Total IMF reached 5 nT at 27/0200Z. The maximum southward component of Bz reached -4 nT at 27/2058Z. Phi was predominantly negative. .Forecast... Near background conditions are expected to persist through 28 Mar. Enhancements from recurrent, positive polarity CH HSS influences are anticipated to begin by late 29 Mar and persist through 30 Mar. Geospace .24 hr Summary... The geomagnetic field was at quiet levels. .Forecast... Primarily quiet levels are expected to persist through 28 Mar. Quiet conditions are then expected to give way to unsettled to active levels by late on 29 Mar and continue into 30 Mar due to positive polarity CH HSS effects. ####018001110#### AXXX82 KWNP 280031 DAYOBS :Product: Summary of Space Weather Observations dayobs.txt :Issued: 2026 Mar 28 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 Mar 27 # Region Location Sunspot Characteristics # Helio Spot Spot Mag. # Num Lat.,CMD Long. Area Extent class count class 4398 S17W55 301 10 1 AXX 1 A 4399 S17E02 244 120 5 CSO 6 B 4400 S12W92 338 50 7 DAI 7 B 4401 N25W02 248 370 12 EKC 28 BG 4402 N18E08 238 70 4 CAO 5 B 4403 N16E40 206 120 3 HSX 2 A 4404 N15E63 183 50 7 CSO 3 B 4405 S25E66 180 270 11 EHO 9 B 4406 N09E62 184 70 2 HSX 1 A