Solar
FORECAST SOL: Normal green MAG: Moderate yellow ION: Moderate yellow
HomeSolarSolar ConditionsSummary and Forecast Friday, Oct 31 2025 02:11 UT
Solar Conditions

Summary and Forecast

Solar Summary

(last updated 30 Oct 2025 23:30 UT)

Activity 30 Oct: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 30 Oct: 120/72

Solar Forecast

(last updated 30 Oct 2025 23:30 UT)

31 Oct 01 Nov 02 Nov Activity R0 R0 R0 Fadeouts None expected None expected None expected 10.7cm/SSN 120/72 130/84 130/84 COMMENT: Solar activity on UT day 30-Oct was at the R0 level, with one low level C-class flare observed. There are currently five numbered sunspot regions visible on the solar disk. AR4267 (N08W21, beta) is the largest region on the disk and has decayed over the UT day. Newly numbered AR4271 (S09E60, alpha) is stable. All other sunspot regions are either stable or in decay. Solar activity is expected to be at the R0 level over 31-Oct to 02-Nov. S0 solar proton conditions were observed on UT day 30-Oct. S0 solar proton conditions are expected over 31-Oct to 02-Nov. Several CMEs were observed over the UT day. A broad northeast-directed CME was observed, visible in LASCO C2 coronagraph imagery from 30/0426UT. This CME is considered a farside event and not geoeffective. A filament eruption was observed, visible in GOES SUVI imagery beginning at 30/0810UT centred near N23W31. A subsequent associated low velocity CME was observed, visible in STEREO-A coronagraph imagery from 30/1153UT. Modelling indicates this CME may contain a minor Earth-directed component, however it is not considered significant. All other CMEs observed on 30-Oct are not considered geoeffective. The solar wind speed on UT day 30-Oct increased, ranging from 475 to 640 km/s and is currently near 640 km/s. The peak total interplanetary magnetic field strength (IMF, Bt) was 16 nT and the north-south IMF component (Bz) range was -15 to +12 nT. A sustained period of southward IMF conditions was observed over the interval 30/0606-0855UT. A second period of southward IMF conditions was observed over the interval 30/0948-1150UT. The solar wind speed is expected to remain elevated over 31-Oct to 02-Nov due to ongoing coronal hole high speed wind stream effects.

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

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