Summary and Forecast

Solar Summary

(last updated 02 Apr 2025 23:31 UT)

Activity 02 Apr: R0 Flares Max Fadeout Freq. Sectors M2.5 01/2231UT possible lower East Pacific/ North American Observed 10.7 cm flux/Equivalent Sunspot Number for 02 Apr: 180/133

Solar Forecast

(last updated 02 Apr 2025 23:31 UT)

03 Apr 04 Apr 05 Apr Activity R0-R2, chance R3 R0-R2 R0-R2 Fadeouts Possible Probable Probable 10.7cm/SSN 180/133 180/133 176/130 COMMENT: Solar activity on UT day 2-Apr was R0, with no significant solar flares. There are currently seven numbered sunspot regions on the solar disk. AR4044 (N17W27, beta) and AR4049 (S31E07, beta) have shown some minor growth and maturation. AR4048 (S15E23, beta-gamma) dominates as the most complex region on the disk, however has been relatively stable in the last day. All other sunspot regions are either stable or in decay. Solar activity is expected to be R0-R2 over 3-5 Apr, although a chance for isolated R3 events is possible from AR4048. No significant CMEs were observed on UT day 2-Apr. S1 solar radiation storm conditions were observed on UT day 2-Apr, trending towards S0. S0-S1 solar radiation storm conditions are expected over 3-5 Apr. The solar wind environment on UT day 2-Apr wild mildly perturbed. The solar wind speed ranged between 500 and 400 km/s. The peak total interplanetary field strength (IMF, Bt) was 12 nT and the north-south IMF component range (Bz) was +5 to -10 nT. Bz was oriented southward for almost 12 hours on 2-Apr, possibly from the passing by CME on 1-Apr and also a small coronal hole now obscured. The solar wind is expected to quieten to near background conditions on 3-Apr, but may increase due to another small coronal hole over 4-5 Apr, likely later in the period.

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