Summary and Forecast

Solar Summary

(last updated 09 Apr 2026 23:30 UT)

Activity 09 Apr: R1 Flares Max Fadeout Freq. Sectors M1.0 0845UT possible lower Mid East/Indian Observed 10.7 cm flux/Equivalent Sunspot Number for 09 Apr: 98/45

Solar Forecast

(last updated 09 Apr 2026 23:30 UT)

10 Apr 11 Apr 12 Apr Activity R0, chance of R1 R0 R0 Fadeouts Possible None expected None expected 10.7cm/SSN 95/41 90/34 90/34 COMMENT: Solar flare activity was at the R1 level on UT day 09-Apr, with an M1.0 flare at 09/0856UT from Active Region (AR) 4409 (N10W90, beta), the largest observed. This region is currently rotating over the western limb, and is one of three visible regions on the solar disk. The other two regions are magnetically simple, and have remained mostly stable over the past UT day. Solar flare activity is forecast to be at the R0 level, with a chance of R1 on 10-Apr. This will decline to R0 solar flare activity on 11-12 Apr as AR 4409 continues to rotate beyond the limb. S0 solar proton conditions were observed throughout 09-Apr, with S0 conditions forecast over 10-12 Apr. No coronal mass ejections (CMEs) were observed over the past UT day. The solar wind speed was largely constant throughout 09-Apr, mostly ranging between 350 and 380 km/s. The interplanetary magnetic field strength (IMF, Bt) peaked at 10 nT during 09-Apr. The north-south component (Bz) ranged between -8 and +6 nT during this time, including an extended southward period between 09/1225-1545UT. The solar wind speed is forecast to increase on 10-Apr due to high speed wind stream effects from a geoeffective equatorial coronal hole. These effects are expected to persist through 11-12 Apr.

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