Product: Weekly Highlights and Forecasts
:Issued: 2026 May 04 0142 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC web contact www.swpc.noaa.gov/content/subscription-services
#
# Weekly Highlights and Forecasts
#
Highlights of Solar and Geomagnetic Activity 27 April - 03 May 2026
Solar activity reached moderate levels on 27 and 18 Apr due to M-class (R1-Minor) activity from Region 4425 (N05, L=162, class/area=Ekc/320 on 28 Apr) and 4420 (S18, L=246, class/area=Eki/300 on 21 Sep). Region 4420 produced the strongest flare of the period, an M1.5/Sn (R1) flare at 28/1353 UTC. The region also produced two Type II radio sweeps alongside C-class activity. The ejecta associated with the activity originated from near the NW limb and was not suspected to contain an Earth-directed component.
The other 13 numbered active regions on the visible disk were either mostly quiet or only produced C-class X-ray activity. No other Earth-directed CMEs were identified in available coronagraph imagery.
No proton events were observed at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit was normal to moderate levels over the past seven days.
Geomagnetic field activity reached G1 (Minor) geomagnetic storm levels on 30 Apr and active levels on 01 May due to the influence of a negative polarity CH HSS. Total magnetic field strength reached a brief peak of 14 nT on 30 Apr, with Bz reaching as far south as -12 nT. Solar wind speeds peak at just over 500 km/s early on 01 May and gradually waned over the next two days. The remainder of the period was at quiet to unsettled levels.
Forecast of Solar and Geomagnetic Activity 04 May - 30 May 2026
Solar activity is likely to be at low levels with a chance for M-Class (R1/R2-Minor/Moderate) throughout the outlook period due to the flare potential of multiple regions on the visible disk as well as multiple complex regions due to return from the farside.
No proton events are expected at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit is likely to reach high levels on 15-20 May due to influence from a recurrent, negative polarity coronal hole. The remainder of the outlook period is expected to at normal to moderate levels.
Geomagnetic field activity is expected to reach G1 (Minor) geomagnetic storm levels on 15-17 May; active levels are likely on 08 May, 18 May, 23 May, and 27 May; unsettled levels are likely on 04 May, 09 May, 21-22 May, and 27 May. All enhancements in geomagnetic activity are forecast in anticipation of influence fron multiple, recurrent, coronal hole HSSs. The remainder of the outlook period is expected to be at mostly quiet levels.
:Product: 27-day Space Weather Outlook Table 27DO.txt
:Issued: 2026 May 04 0142 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC web www.swpc.noaa.gov/content/subscription-services
#
# 27-day Space Weather Outlook Table
# Issued 2026-05-04
#
# UTC Radio Flux Planetary Largest
# Date 10.7 cm A Index Kp Index
2026 May 04 140 8 3
2026 May 05 140 6 2
2026 May 06 135 6 2
2026 May 07 130 6 2
2026 May 08 135 12 4
2026 May 09 130 10 3
2026 May 10 130 6 2
2026 May 11 125 5 2
2026 May 12 125 5 2
2026 May 13 120 5 2
2026 May 14 115 5 2
2026 May 15 120 25 5
2026 May 16 120 20 5
2026 May 17 125 20 5
2026 May 18 130 15 4
2026 May 19 130 5 2
2026 May 20 130 5 2
2026 May 21 130 8 3
2026 May 22 120 10 3
2026 May 23 125 12 4
2026 May 24 125 5 2
2026 May 25 125 5 2
2026 May 26 130 5 2
2026 May 27 135 12 4
2026 May 28 135 10 3
2026 May 29 130 8 3
2026 May 30 125 8 3
(NOAA)
