Summary and Forecast

Solar Summary

(last updated 06 Apr 2026 23:30 UT)

Activity 06 Apr: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 06 Apr: 116/68

Solar Forecast

(last updated 06 Apr 2026 23:30 UT)

07 Apr 08 Apr 09 Apr Activity R0-R1 R0-R1 R0-R1 Fadeouts Possible Possible Possible 10.7cm/SSN 110/60 105/54 105/54 COMMENT: Solar flare activity was at the R0 level on UT day 06-Apr. Solar region AR4409 (N05W37, beta-gamma) is the most significant solar region on the visible solar disk and is in decay. Small solar region AR4412 (N10W01, beta) is growing. There are currently seven sunspot regions on the visible solar disk. The solar regions are mostly small in size and generally located in the western solar hemisphere with the eastern solar hemisphere largely devoid of spots. All other regions are either stable or in decay. A new solar region is rotating onto the solar disk at solar latitude N12. A small 10-15 degree long solar filament located at S40W55 erupted at 06/1350UT in GONG H-alpha imagery. Solar flare activity is expected to be R0-R1 over 07-09 Apr. S0 solar radiation storm conditions were observed on 06-Apr. S0 solar radiation storm conditions are expected over 07-09 Apr. No Earth directed coronal mass ejections (CMEs) were observed. No CME appeared to follow the filament eruption in the far southwest solar quadrant, with coronagraph imagery available up to 06/1524UT. A number of coronal holes appear to be in the eastern solar hemisphere. On the previous solar rotation this was one large thin hole and now appears to have closed in places, resulting in isolated hole segments. The solar wind speed was steady and moderate to strong on 06-Apr. The solar wind speed ranged from 498 to 545 km/s, and is currently at 500 km/s. The peak total interplanetary magnetic field strength (IMF, Bt) was 5 nT and the north-south component (Bz) range was -5 and +5 nT. The solar wind speed is expected to continue to decline towards background levels over 07-08 Apr. Solar wind 27 day recurrence patterns suggest a strong increase in the solar wind over 09-10 Apr, however on this solar rotation the coronal hole appears to be more segemented and reduced in area, implying a reduced influence on the solar wind speed. The flux of electrons with an energy of greater than 2 MeV at geosynchronous orbit as measured by the US GOES satellite has been enhanced, which is statistically associated with the increased risk of geosynchronous satellite operational anomalies.

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