Summary and Forecast

Solar Summary

(last updated 21 Jun 2026 23:30 UT)

Activity 21 Jun: R2 Flares Max Fadeout Freq. Sectors M2.6 0246UT possible lower E. Asia/Aust. M7.0 1929UT probable lower East Pacific/ North American Observed 10.7 cm flux/Equivalent Sunspot Number for 21 Jun: 128/81

Solar Forecast

(last updated 21 Jun 2026 23:30 UT)

22 Jun 23 Jun 24 Jun Activity R1-R2 R1-R2 R1-R2 Fadeouts Possible Possible Possible 10.7cm/SSN 120/72 120/72 120/72 COMMENT: Solar activity on UT day 21-Jun reached R2, with an M7 class solar flare (R2) from active region (AR) 4473 (S08E59, gamma). This region also produced an M2.7 class flare. There are currently five numbered sunspot regions on the solar disk, although AR 4473 is the only region which has shown any meaningful change with instability in its leading spots. Solar flare activity is expected to be R1-R2 over 22-24 Jun due to 4473. A slow partial halo CME was observed associated with the M2.7 flare, but is not expected to be geoeffective. Similarly, a partial halo is associated with the M7 solar flare, but there is not adequate imagery yet available for a full analysis. Given the location the CME launched from it is not expected to be significantly geoeffective, however. No other noteworthy CMEs were observed on 21-Jun. S0 solar radiation storm conditions were observed on UT day 21-Jun. S0 solar radiation storm conditions are expected over 22-24 Jun. The solar wind environment on UT day 21-Jun was near background levels. The solar wind speed ranged between 410 to 360 km/s. The peak total interplanetary field strength (IMF, Bt) was +7 to -6 nT. The solar wind environment is expected to remain mostly quiet over 22-23 Jun, but wind speeds may begin to become enhanced by 24-Jun due to several patchy coronal holes.

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