Summary and Forecast

Solar Summary

(last updated 30 Jun 2025 23:30 UT)

Activity 30 Jun: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 30 Jun: 128/81

Solar Forecast

(last updated 30 Jun 2025 23:30 UT)

01 Jul 02 Jul 03 Jul Activity R0-R1 R0-R1 R0-R1 Fadeouts Possible Possible Possible 10.7cm/SSN 126/79 125/78 125/78 COMMENT: Solar activity on UT day 30-Jun was R0, with no significant solar flares. There are currently seven numbered sunspot regions on the solar disk. AR4127 (S17E21, beta) has shown some minor growth but has been quiet in the past day. New region AR4129 (S03E35), while still premature, may develop some complexity. Solar activity is expected to be R0 with a chance of R1 over 1-3 Jul. No Earth directed CMEs were observed in available imagery. A weak partial halo CME from 28-Jun has been assessed as Earth directed and may arrive late 1-Jul or early on 2-Jul. S0 solar radiation storm conditions were observed on UT day 30-Jun. S0 solar radiation storm conditions are expected over 1-3 Jul. The solar wind environment was mostly steady on UT day 30-Jun. The solar wind speed mostly ranged from 400-500 km/s, elevated due to coronal hole activity but on a general declining trend. The peak total interplanetary field strength (IMF, Bt) was 7 nT and the north-south IMF component range (Bz) was +6 to -6 nT. The solar wind is expected to be mildly elevated due to waning coronal hole effects, then become disturbed on either late 1-Jul or early 2-Jul due to the arrival of a weak CME from 28-Jun.

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