Summary and Forecast

Solar Summary

(last updated 19 Jun 2026 23:30 UT)

Activity 19 Jun: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 19 Jun: 111/62

Solar Forecast

(last updated 19 Jun 2026 23:30 UT)

20 Jun 21 Jun 22 Jun Activity Low Low to moderate Low to moderate Fadeouts R0 R0-R1 R0-R1 10.7cm/SSN 112/63 115/66 120/72 COMMENT: Solar activity on UT day 19-Jun was R0, with no solar flares. There are currently four numbered sunspot regions on the solar disk. All sunspot regions are currently either stable or in decay. Solar activity is expected to be R0 on 20-Jun, with a chance for R1 flares over 21-22 Jun as new active region (AR) 4472 (S12E67, beta) rotates into view. No Earth-directed CMEs were observed on UT day 19-Jun. S0 solar radiation storm conditions were observed on UT day 19-Jun. S0 solar radiation storm conditions are expected over 20-22 Jun. The solar wind environment on UT day 19-Jun was steady. The solar wind speed ranged from 350 to near 430 km/s. The peak total interplanetary field strength (IMF, Bt) was 11 nT and the north-south IMF component range (Bz) was +9 to -7 nT. The solar wind environment is expected to remain near background levels over 20-22 Jun.

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