Summary and Forecast

Solar Summary

(last updated 31 Jan 2026 23:30 UT)

Activity 31 Jan: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 31 Jan: 141/95

Solar Forecast

(last updated 31 Jan 2026 23:30 UT)

01 Feb 02 Feb 03 Feb Activity R0-R1 R0-R1 R0-R1 Fadeouts Possible Possible Possible 10.7cm/SSN 130/84 125/78 120/72 COMMENT: Solar flare activity was at the R0 level on UT day 31-Jan. There are currently nine numbered and one unnumbered sunspot regions visible on the solar disk. Newly numbered region AR4366 (N16E53, beta-gamma-delta) has shown significant spot development over the past 24 hours and is the most notable sunspot region on the solar disk. An unnumbered region has recently rotated onto the solar disk at around S02E80 with possible alpha magnetic classification. All other regions appear stable or in decay. Solar flare activity has increased slightly as AR4366 has developed and is expected to be at R0-R1 levels over 01-03 Feb. Solar radiation storm conditions were at the S0 level on UT day 31-Jan, despite mild enhancements in the >10 MeV proton flux as measured at GOES. S0 conditions are expected over 01-03 Feb. No Earth-directed coronal mass ejections were observed over the past 24 hours. A west directed CME is visible in SOHO and STEREO-A imagery from 31/0525UT. This event is concurrent with an eruption on the western limb at the equator, visible in GOES SUVI and SDO imagery from 31/0454UT. This CME is not considered geoeffective. The solar wind speed was in decline on 31-Jan, mostly ranged between 480 km/s and 380 km/s across the UT day and is currently near 385 km/s. The interplanetary magnetic field strength (IMF, Bt) peaked at 4 nT, with the North-South component (Bz) ranging between -2 and +2 nT over the UT day. The solar wind speed is expected to remain near background levels over 01-03 Feb.

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