Summary and Forecast

Solar Summary

(last updated 10 Jun 2025 23:30 UT)

Activity 10 Jun: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 10 Jun: 129/82

Solar Forecast

(last updated 10 Jun 2025 23:30 UT)

11 Jun 12 Jun 13 Jun Activity R0-R1 R0-R1 R0-R1 Fadeouts Possible Possible Possible 10.7cm/SSN 115/66 120/72 120/72 COMMENT: Solar activity on UT day 10-Jun was at the R0 level. Solar region AR4107 (S19W38, beta-gamma) produced several C class flares, the largest a C5.5 at 10/1052UT. This small to medium sized region has shown rapid growth in the past 24 hours. Medium sized solar region AR4105 (S15W16, beta) which was in slow decay over 07-08 Jun, has shown intermediate spot redevelopment over the last two days. Small regions AR4110 (N05E02, beta) and AR4112 (S09E39, beta) have shown slight growth. A very small new region has rotated onto the disk over the northeast solar limb just to the east of stable region AR4111 (N14E51, beta). There has been some plasma spray activity on the northeast limb at solar latitude N15 during the interval 10/0000-0800UT, with the rest of the solar disk remaining relatively quiet. There are currently six numbered sunspot regions on the solar disk. Other regions are stable or in decay. Old solar region AR4098 which produced an R3 flare on its previous transit, though exhibiting some decay as it rotated off disk, appears to have not returned to the southeast solar limb at solar latitude S04 on 10-Jun. Solar activity is expected to be at the R0-R1 level over 11-13 Jun. S0 solar radiation storm conditions were observed on 10-Jun. S0 solar radiation storm conditions are expected over 11-13 Jun. No Earth directed CMEs have been observed. CME activity was observed from behind the northeast solar limb during the interval 10/0048-0800UT. The solar wind speed on UT day 10-Jun was mostly steady and moderately elevated, ranging between 430 to 470 km/s, and is currently near 430 km/s. The peak total interplanetary field strength (IMF, Bt) was 8 nT and the north-south IMF component range was +4 to -7 nT. Moderately elevated solar wind conditions are expected due to high speed wind stream effects from a small equatorial coronal hole, now in the northwest solar quadrant. A larger coronal hole is visible in the southeast solar quadrant and is approaching the solar central meridian.

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