Summary and Forecast

Solar Summary

(last updated 25 Oct 2025 23:30 UT)

Activity 25 Oct: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 25 Oct: 127/80

Solar Forecast

(last updated 25 Oct 2025 23:30 UT)

26 Oct 27 Oct 28 Oct Activity R0 R0 R0 Fadeouts None expected None expected None expected 10.7cm/SSN 130/84 125/78 125/78 COMMENT: Solar activity on UT day 25-Oct was at the R0 level, with low level C-class flares observed. There are currently seven numbered sunspot regions visible on the solar disk. Newly numbered AR4269 (S12E45, beta) recently appeared on the disk and has shown spot growth. AR4262 (S13W29, beta) has shown decay in its trailer spots. All other sunspot regions are either stable or in decay. Solar activity is expected to be at the R0 level over 26-28 Oct. S0 solar proton conditions were observed on UT day 25-Oct. S0 solar proton conditions are expected over 26-28 Oct. No Earth-directed CMEs have been observed. A northward CME was observed, visible in LASCO C2 coronagraph imagery from 25/1124UT. This CME is considered a farside event and therefore not geoeffective. A low velocity southward CME visible from 25/1200UT is also not considered Earth-directed. The solar wind speed on UT day 25-Oct declined, ranging from 395 to 545 km/s and is currently near 395 km/s. The peak total interplanetary magnetic field strength (IMF, Bt) was 7 nT and the north-south IMF component (Bz) range was -6 to +6 nT. A southern hemisphere coronal hole is currently crossing the central meridian and is expected to influence the solar wind speed on 28-Oct. The solar wind speed is expected to remain near background levels over 26-27 Oct, then increase on 28-Oct.

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