Product: Weekly Highlights and Forecasts
:Issued: 2026 Apr 20 0331 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC web contact https://www.swpc.noaa.gov/content/subscription-services
#
# Weekly Highlights and Forecasts
#
Highlights of Solar and Geomagnetic Activity 13 - 19 April 2026
Solar activity was at very low to low levels during the period. Very low levels occurred on 14, 15 and 19 Apr, while low levels were observed on 13, 16, 17, and 18 April.
Region 4419 (N14, L=314, class/area=Eki/360 on 17 Apr) was the most active region of the period, responsible for 5 out of the 7 C-class flares observed during the week, including the largest one: a C4.1/Sf at 17/0442 UTC. The remaining 2 C-class flares of the period were: a C1.1/Sf at 13/1137 UTC from Region 4414 (N15, L=026, class/area=Dro/030 on 08 Apr) and a C1.6 at 18/0704 UTC from Region 4416 (N19, L=047, class/area=Dai/140 on 12 Apr). Coronal activity was observed during the week with some filament eruptions and few CMEs without 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 on 13-17 Apr, followed by a day at moderate levels on 18 Apr and returning to high levels on 19 Apr, with a maximum flux of 3,250 pfu observed at 15/1800 UTC.
Geomagnetic field activity was quiet to Moderate storm levels during the period. From 13 to 17 Apr, the geomagnetic activity remained at quiet levels. On 18 Apr, the arrival of a negative polarity CH HSS influence disturbed the Geospace, elevating the activity from unsettled to Moderate storm levels. On 19 Apr, Moderate storm levels were observed during an isolated synoptic period (0600-0900 UTC) and the geomagnetic activity returned to quiet level by the end of the day as the CH HSS effects waned.
Forecast of Solar and Geomagnetic Activity 20 April - 16 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 16 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 20-22 Apr, 27-28 Apr, 30 Apr-05 May, and 08-14 May. Normal to moderate electron flux levels are expected on 23-26 Apr, 29 Apr, 06-07 May, and 15-16 May.
Geomagnetic field activity is expected to remain at quiet to active levels during most of the outlook period, with the exception of 5 days when G1 (Minor) storm levels are anticipated due to the recurrent influence of CH HSS: 29-30 Apr (-CH HSS), 07 May (+CH HSS) and 15-16 May (-CH HSS).
Product: 27-day Space Weather Outlook Table 27DO.txt
:Issued: 2026 Apr 20 0331 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC web https://www.swpc.noaa.gov/content/subscription-services
#
# 27-day Space Weather Outlook Table
# Issued 2026-04-20
#
# UTC Radio Flux Planetary Largest
# Date 10.7 cm A Index Kp Index
2026 Apr 20 105 18 4
2026 Apr 21 110 15 4
2026 Apr 22 120 8 3
2026 Apr 23 125 5 2
2026 Apr 24 120 8 3
2026 Apr 25 115 8 3
2026 Apr 26 120 5 2
2026 Apr 27 125 5 2
2026 Apr 28 125 5 2
2026 Apr 29 125 20 5
2026 Apr 30 125 18 5
2026 May 01 125 12 4
2026 May 02 125 10 4
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 5
2026 May 08 90 15 4
2026 May 09 90 8 3
2026 May 10 95 5 2
2026 May 11 100 5 2
2026 May 12 105 5 2
2026 May 13 110 5 2
2026 May 14 110 5 2
2026 May 15 105 25 5
2026 May 16 105 20 5
(NOAA)
