Summary and Forecast

Solar Summary

(last updated 30 Mar 2026 23:32 UT)

Activity 30 Mar: R3 Flares Max Fadeout Freq. Sectors X1.5 0319UT probable all E. Asia/Aust. Observed 10.7 cm flux/Equivalent Sunspot Number for 30 Mar: 152/107

Solar Forecast

(last updated 30 Mar 2026 23:32 UT)

31 Mar 01 Apr 02 Apr Activity R1-R2 R1-R2 R1-R2 Fadeouts Possible Possible Possible 10.7cm/SSN 152/107 155/109 155/109 COMMENT: Solar activity on UT day 30-Mar was R3, with an isolated X1.4 flare observed from AR4405 (S26E34, beta) from 0247UT. There are currently nine Active Regions on the Solar disk. Solar region AR4401 (N24W36, beta) continues to show decay in its trailer spots and umbral convergence in its leader spot. AR4303 (N15E05, beta) has shown some east-west separation. All other sunspot regions are either stable or in decay. Solar activity is expected to be R1-R2 over 31-Mar to 02-Apr. An Earth directed CME was observed, following the X1.4 flare. It was first visible on STEREO-A imagery at 0323UT and is also visible on LASCO imagery. This CME has been subsequently modelled, with a glancing blow anticipated late on the UT day of the 31-Mar. S0 solar radiation storm conditions were observed on UT day 30-Mar. S0 solar radiation storm conditions are expected over 31-Mar to 02-Apr. An isolated coronal hole, visible in the northwest solar quadrant, will pass beyond the western limb in the next 24 hours. Another is visible in the southeast solar quadrant. The solar wind speed on UT day 30-Mar was largely stable and moderately elevated, due to the solar wind stream from the coronal hole in the northwest solar quadrant. The solar wind ranged from 430 to 500 km/s and is currently at 440 km/s. The peak total interplanetary field strength (IMF, Bt) was 12 nT and the north-south IMF component range (Bz) was +12 to -7 nT. The IMF Bz component was predominantly southward during the interval 30/0800-1420UT. The solar wind speed is expected to remain at these levels over the 31-Mar to 02-Apr. The coronal hole in the southeast solar quadrant is beginning to approach the solar central meridian and 27 day recurrence patterns suggest the Earth will enter the wind stream from this hole on 03-Apr.

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