Summary and Forecast

Solar Summary

(last updated 26 Jan 2026 23:30 UT)

Activity 26 Jan: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 26 Jan: 153/108

Solar Forecast

(last updated 26 Jan 2026 23:30 UT)

27 Jan 28 Jan 29 Jan Activity R0, chance of R1 R0, chance of R1 R0, chance of R1 Fadeouts None expected None expected None expected 10.7cm/SSN 150/105 145/99 140/94 COMMENT: Solar flare activity was at the R0 level on UT day 26-Jan, with a C8.8 flare from Active Region (AR) 4355 (S12E19, beta) being the largest observed. This region is one of eight numbered regions on the solar disk, with AR 4349 (S14W13, alpha) remaining the largest. This region has shown some minor decay over the last UT day, while AR 4351 (S05W45, beta-gamma) and AR 4347 (N11W58, beta) have shown some growth during the same period. A new region has appeared on the disk at S08E08 and currently has a beta magnetic classification. All other regions appear stable or in decay, with three previously flare-active regions, AR 4341 (S09W85, alpha), AR 4342 (N18W81, alpha), and AR 4345 (S16W78, alpha), expected to rotate off the visible solar disk within the next 24 hours. Solar flare activity is expected to remain at the R0 level, with a chance of R1, over 27-29 Jan. Solar radiation storm conditions were at the S0 level on UT day 26-Jan, with the proton flux continuing to slowly decline. Solar proton flux began the day at 0.672 pfu, and is currently at 0.565 pfu. S0 conditions, with a chance of S1, are forecast for 27-Jan, with a decline to S0 conditions forecast for 28-29 Jan. No Earth directed coronal mass ejections were observed over the past 24 hours in available coronagraph imagery. The solar wind speed broadly ranged between 450-500 km/s across the UT day, with several small intervals of elevated solar wind speed of 550 km/s observed. The interplanetary magnetic field strength (IMF, Bt) peaked at 9 nT during 26-Jan, with the North-South component (Bz) ranging between -6 and +7 nT over the last UT day. The solar wind speed is expected to show a small enhancement over 27-28 Jan, as a small equatorial coronal hole high speed wind stream becomes geoeffective. A decline in the solar wind is expected on 29-Jan, as this high speed wind stream continues to rotate across the solar disk.

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