Solar
FORECAST SOL: Moderate yellow MAG: Normal green ION: Normal green
HomeSolarSolar ConditionsSummary and Forecast Wednesday, Apr 29 2026 06:10 UT
Solar Conditions

Summary and Forecast

Solar Summary

(last updated 28 Apr 2026 23:30 UT)

Activity 28 Apr: R1 Flares Max Fadeout Freq. Sectors M1.0 1223UT possible lower European M1.5 1353UT possible lower European M1.1 1407UT possible lower South American/ Atlantic Observed 10.7 cm flux/Equivalent Sunspot Number for 28 Apr: 149/104

Solar Forecast

(last updated 28 Apr 2026 23:30 UT)

29 Apr 30 Apr 01 May Activity R1, chance of R2 R1, chance of R2 R1, chance of R2 Fadeouts Possible Possible Possible 10.7cm/SSN 148/102 148/102 145/99 COMMENT: Solar flare activity reached the R1 level on UT day 28-Apr, with an M1.0 flare at 28/1217UT, and a M1.5 flare at 28/1349UT, both originating from Active Region (AR) 4420 (N16W44, beta-delta). This region is one of seven sunspot regions on the visible disk, and has shown some minor decay over the past UT day. Previously flare active region AR 4425 (N05E24, beta-gamma) has shown some growth and spot separation in the last 24 hours. AR 4428 (S23E14, beta) has also shown some growth over the same period. All other regions are either stable or in decay. Solar flare activity is forecast to be at the R1 level, with a chance of R2 over 29-Apr to 01-May, given the presence of large, magnetically complex sunspot regions on the Earth‑facing solar disk. S0 solar proton conditions were observed throughout UT day 28-Apr, with solar proton flux persisting at background levels. S0 solar proton conditions are forecast for 29-Apr to 01-May. No coronal mass ejections (CMEs) were observed over the past UT day. The solar wind speed declined towards background levels throughout UT day 28-Apr, beginning the UT day at approximately 430 km/s, and declining to between 350 and 370 km/s. The interplanetary magnetic field strength (IMF, Bt) peaked at 5 nT during the UT day, and the north-south component (Bz) ranged between -2 and +4 nT over the UT day. The solar wind speed is expected to increase over 29-30 Apr due to high speed wind streams from a small equatorial coronal hole. These conditions will then begin to ease on 01-May.

Solar Activity levels are explained in the SWS Solar Terrestrial Glossary.

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