Summary and Forecast

Solar Summary

(last updated 03 Apr 2025 23:30 UT)

Activity 03 Apr: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 03 Apr: 178/131

Solar Forecast

(last updated 03 Apr 2025 23:30 UT)

04 Apr 05 Apr 06 Apr Activity R0-R1, chance R2 R0-R1, chance R2 R0-R1, chance R2 Fadeouts Possible Possible Possible 10.7cm/SSN 178/131 176/130 176/130 COMMENT: Solar activity on UT day 3-Apr was R0, with no significant solar flares. There are currently seven numbered sunspots on the solar disk. AR4044 (N17W44, beta) and AR4049 (S31W09, beta) have shown some slight growth in the past day. AR4048 (S15E05, beta-gamma) maintains being the largest and most complex region on the disk, however has been generally stable in the past 24 hours while its positive and negative poles continue to separate. All other sunspot regions are either stable or in decay. Solar activity is expected to be R0-R1 with a chance for R2 over 4-6 Apr. No Earth directed CMEs were observed on UT day 3-Apr. S0 solar radiation storm conditions were observed on UT day 3-Apr, with the >10 MeV protons continuing their downward trend towards background levels. S0 solar radiation storm conditions are expected over 4-6 Apr. The solar wind speed was steady on UT day 3-Apr and ranged from 406 to 476 km/s. The solar wind strength was on a slow incline for most of the day with a peak total interplanetary field strength (IMF, Bt) of 11 nT and the north-south IMF component range (Bz) ranging from +8 to -11 nT. Bz was oriented southward for several periods of the day. The solar wind speed is expected to be disturbed over 4-5 Apr due to the onset of a small coronal hole, which based on recurrence patterns, was associated with a co-rotating interaction region. The solar wind may begin to return to background conditions by 6-Apr.

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