:Product: Weekly Highlights and Forecasts
:Issued: 2026 Apr 13 0104 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 06 - 12 April 2026
Solar activity was at very low to moderate levels during the period. Moderate levels were reached on 09 Apr, with low levels observed on 06-08 Apr and 11-12 Apr. Very low levels occurred on 10 Apr.
Region 4409 (N02, L=158, class/area=Eai/190 on 07 Apr) was the most active region of the period, producing 11 C-class flares and the only M-class flare of the period, an impulsive M1.0/Sf at 09/0845
UTC. Region 4417 (S08, L=123, class/area=Dao/30 on 12 Apr) also contributed notable activity with 7 C-class flares after appearing quickly on 11 Apr near the West limb. Other activity included a
C8.7/Sf flare from Region 4414 (N15, L=26, class/area Dro/30 on 08 Apr) at 08/1543 UTC, which was associated with Type III radio emissions and a weak CME without any Earth-directed components.
No proton events were observed at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit was at high levels throughout the reporting period. Flux levels reached a peak value of 10,679 pfu at 09/1605 UTC.
Geomagnetic field activity ranged from quiet to active levels during the period. The beginning of the period (06-07 Apr) saw quiet to unsettled conditions as the influence of a negative polarity coronal
hole high speed stream (-CH HSS) continued to wane. From 10-12 Apr, quiet to active levels were observed under the onset and influence of a positive polarity CH HSS (+CH HSS). Quiet conditions prevailed
during all other days of the period under a nominal solar wind regime.
Forecast of Solar and Geomagnetic Activity 13 April - 09 May 2026
Solar activity is expected to be at low levels, with a varying chance for M-class (R1-R2/Minor-Moderate) flares and a slight chance for X-class (R3/Strong or greater) flares through 09 May.
No proton events are expected at geosynchronous orbit, barring any significant, non-recurrent solar activity.
The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach high levels on 13-17 Apr, 19-24 Apr, 26-28 Apr, 30 Apr-05 May, and 08-09 May. Normal to moderate flux levels are
expected on 18 Apr, 25 Apr, 29 Apr, and 06-07 May.
Geomagnetic field activity is anticipated to reach G1-G2 (Minor-Moderate) storm levels on 19 Apr and 29 Apr due to -CH HSS influences, and on 07 May due to +CH HSS influences. Active
conditions are expected on 18 Apr, 20 Apr, and 30 Apr-01 May in response to -CH HSS effects, and on 15 Apr, 25 Apr, and 08 May due to +CH HSS effects. Mostly quiet to unsettled conditions are
expected for all other days of the period.
Product: 27-day Space Weather Outlook Table 27DO.txt
:Issued: 2026 Apr 13 0104 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
#
# 27-day Space Weather Outlook Table
# Issued 2026-04-13
#
# UTC Radio Flux Planetary Largest
# Date 10.7 cm A Index Kp Index
2026 Apr 13 95 8 3
2026 Apr 14 90 8 3
2026 Apr 15 100 12 3
2026 Apr 16 105 8 3
2026 Apr 17 110 5 2
2026 Apr 18 110 15 3
2026 Apr 19 110 20 4
2026 Apr 20 120 12 4
2026 Apr 21 130 10 3
2026 Apr 22 140 8 3
2026 Apr 23 145 5 2
2026 Apr 24 145 8 3
2026 Apr 25 140 12 4
2026 Apr 26 140 10 3
2026 Apr 27 140 5 2
2026 Apr 28 140 5 2
2026 Apr 29 135 20 5
2026 Apr 30 130 18 5
2026 May 01 125 12 4
2026 May 02 125 10 3
2026 May 03 115 8 3
2026 May 04 108 8 3
2026 May 05 105 5 2
2026 May 06 100 5 2
2026 May 07 95 20 4
2026 May 08 90 15 3
2026 May 09 90 8 3
(NOAA)
