Summary and Forecast

Solar Summary

(last updated 27 Jan 2026 23:30 UT)

Activity 27 Jan: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 27 Jan: 144/98

Solar Forecast

(last updated 27 Jan 2026 23:30 UT)

28 Jan 29 Jan 30 Jan Activity R0 Chance R1 R0 Chance R1 R0 Chance R1 Fadeouts None expected Possible Possible 10.7cm/SSN 145/99 140/94 130/84 COMMENT: Solar flare activity was at the R0 level on UT day 27-Jan. Active Region (AR) 4355 (S12E09, beta) is currently the largest observed region on the solar disk. This region is one of six numbered regions on the solar disk and three unnumbered. All other regions appear stable or in decay. Solar flare activity is expected to remain at the R0 level, with a chance of R1, over 28-30 Jan. Solar radiation storm conditions were at the S0 level on UT day 27-Jan. S0 conditions are expected for 28-30 Jan. No Earth directed coronal mass ejections were observed over the past 24 hours. The solar wind speed ranged between 489-382 km/s across the UT day and is currently 465 km/s. The interplanetary magnetic field strength (IMF, Bt) peaked at 9 nT during 27-Jan, with the North-South component (Bz) ranging between -5 and +5 nT over the last UT day. The solar wind speed is expected to show a small enhancement over 28-30 Jan, due to coronal hole high speed wind stream effects.

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