Solar
FORECAST SOL: Normal green MAG: Moderate yellow ION: Normal green
HomeSolarSolar ConditionsSummary and Forecast Wednesday, Sep 23 2026 01:19 UT
Solar Conditions

Summary and Forecast

Solar Summary

(last updated 22 Sep 2026 23:30 UT)

Activity 22 Sep: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 22 Sep: 118/70

Solar Forecast

(last updated 22 Sep 2026 23:30 UT)

23 Sep 24 Sep 25 Sep Activity R0, chance R1 R0, chance R1 R0, chance R1 Fadeouts None expected None expected None expected 10.7cm/SSN 120/72 120/72 122/75 COMMENT: Solar flare activity was at the R0 level on 22-Sep, with three C-class flares recorded over the period. Nine active regions are currently on the solar disk. Active Region (AR) 4534 (N10W32, beta) has remained dynamic in nature, with sunspot growth followed by later decay in the UT day. The past 24 hours has seen the development of AR 4539 (S10E30, beta). AR 4536 (N03W10) has seen some growth over the 22-Sep. AR 4537 (N07W24, beta) and 4538 (N12W20, beta) have also grown in size and sunspot number. Two other small ARs have developed close to the western limb. These are AR 4540 (S11W49, beta) and a yet unnumbered region (S05W44, beta). All other regions have remained stable. Solar flare activity is forecast at the R0 level, with a chance of R1 over 23-25 Sep. Solar radiation storm conditions were at the S0 level on 22-Sep, with the solar proton flux at background levels. S0 solar radiation storm conditions are forecast over 23-25 Sep. No Earth-directed coronal mass ejections (CMEs) were observed over the past UT day. The solar wind environment was stable ranging from 340-290 km/s, the latter value being the current speed. The interplanetary magnetic field strength (IMF, Bt) was stable over the UT day, peaking at 4.8 nT. The north-south component (Bz) ranged between -4.1 and +3.6 nT over the same period. The solar wind speed is expected to rise over the 23-Sep, as the Earth begins to connect with a coronal hole high speed wind stream. The solar wind speed is expected to remain elevated over the 24-Sep due to this high speed wind stream, before declining throughout the 25-Sep.

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

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