Summary and Forecast

Solar Summary

(last updated 20 Jun 2025 23:31 UT)

Activity 20 Jun: High Flares Max Fadeout Freq. Sectors X1.9 19/2350UT probable all West Pacific M1.0 1740UT possible lower South American/ Atlantic Observed 10.7 cm flux/Equivalent Sunspot Number for 20 Jun: 130/84

Solar Forecast

(last updated 20 Jun 2025 23:31 UT)

21 Jun 22 Jun 23 Jun Activity R0-R1, chance R3 R0-R1, chance R3 R0-R1, chance R3 Fadeouts Possible Possible Possible 10.7cm/SSN 130/84 130/84 130/84 COMMENT: Solar activity on UT day 20-Jun was R3, with an isolated X1 solar flare at 19/2352 UT from AR4114 (N16W53, beta). AR4117 (S14E40, beta) also produced an M1 flare. There are currently six numbered sunspot regions on the solar disk, however all regions are currently stable and have shown little change over the past day. Solar activity is expected to be R0-R1 over 21-23 Jun, however a chance for isolated R3 events may still be possible, although unlikely. No Earth-directed CMEs were observed on UT day 20-Jun. S0 solar radiation storm conditions were observed on UT day 20-Jun. S0 solar radiation storm conditions are expected over 21-23 Jun. The solar wind environment on UT day 20-Jun was mostly steady. The solar wind speed ranged from 518 to 631 km/s, slightly elevated due to coronal hole activity but beginning to decline. The peak total interplanetary field strength (IMF, Bt) was 9 nT and the north-south IMF component range (Bz) was +7 to -6 nT. The solar wind environment is expected to remain at similar levels over 21-23 Jun, possibly becoming slightly more elevated at the end of the period due to further coronal hole activity.

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