Summary and Forecast

Solar Summary

(last updated 18 Feb 2026 23:30 UT)

Activity 18 Feb: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 18 Feb: 119/71

Solar Forecast

(last updated 18 Feb 2026 23:30 UT)

19 Feb 20 Feb 21 Feb Activity R0 R0 R0 Fadeouts None expected None expected None expected 10.7cm/SSN 120/72 120/72 115/66 COMMENT: Solar flare activity on UT day 18-Feb was at the R0 level, with the largest flare a C2.2 flare at 18/2042UT. There are currently three numbered sunspot regions visible on the solar disk. All sunspot regions are small, magnetically simple and either stable or in decay. Solar flare activity is expected to be at the R0 level over 19-21 Feb. S0 solar radiation storm conditions were observed on UT day 18-Feb. S0 solar radiation storm conditions are expected over 19-21 Feb. No Earth-directed coronal mass ejections (CMEs) have been observed. A large, southwest directed CME is visible in SOHO and STEREO-A imagery from 18/0448UT. Associated with coronal movement over the southwest limb at around S28, visible in SDO, GOES SUVI and H-Alpha imagery from 18/0419UT. This CME is considered a far side event and not geoeffective. The solar wind speed on UT day 18-Feb decreased, mostly ranging between 570 and 430 km/s and is currently near 455 km/s. The peak total interplanetary magnetic field strength (IMF, Bt) was 7 nT and the north-south IMF component (Bz) range was -4 to +5 nT. The solar wind speed is expected to continue to decline towards background levels and remain there over 19-21 Feb.

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