Product: Weekly Highlights and Forecasts
:Issued: 2026 Aug 17 0058 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 10 - 16 August 2026
Solar activity ranged from very low to low levels throughout the
period. No R1 (Minor) or greater events were observed. The largest
flare was a C8.2/Sn at 16/1928 UTC from Region 4506 (N12, L=215,
class/area=Dao/100 on 16 Aug). An associated CME was observed in
LASCO C2 imagery following the C8.2 flare, but analysis is ongoing
in order to determine any Earth-directed component. Other activity
included the lift-off of a large filament near S16E22 at 14/0332 UTC
which produced a CME that is expected to arrive on 17-18 Aug.
No proton events were observed at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit was
normal to moderate levels throughout the period.
Geomagnetic field activity was at quiet or quiet to unsettled levels
throughout the period.
Forecast of Solar and Geomagnetic Activity 17 August - 12 September 2026
Solar activity is expected to range from very low to low levels
throughout the outlook period, with a slight chance for an R1-R2
(Minor-Moderate) event.
No proton events are expected at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit is
expected to reach high levels on 19-20, 23-24, and 28 Aug. Normal to
moderate levels are expected to prevail throughout the remainder of
the outlook period.
Geomagnetic field activity is expected to reach active levels on
17-18 Aug due to the anticipated arrival of a CME that left the Sun
on 14 Aug. Active conditions are expected again on 21-22 Aug and 04
Sep due to the influences of a CH HSS. Quiet and quiet to unsettled
conditions are expected to prevail throughout the remainder of the
outlook period.
Product: 27-day Space Weather Outlook Table 27DO.txt
:Issued: 2026 Aug 17 0058 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC contact: www.swpc.noaa.gov/content/subscription-services
#
# 27-day Space Weather Outlook Table
# Issued 2026-08-17
#
# UTC Radio Flux Planetary Largest
# Date 10.7 cm A Index Kp Index
2026 Aug 17 130 15 4
2026 Aug 18 125 12 4
2026 Aug 19 130 5 2
2026 Aug 20 130 5 2
2026 Aug 21 125 12 4
2026 Aug 22 125 12 4
2026 Aug 23 120 10 3
2026 Aug 24 115 8 3
2026 Aug 25 115 5 2
2026 Aug 26 110 5 2
2026 Aug 27 110 5 2
2026 Aug 28 110 5 2
2026 Aug 29 110 5 2
2026 Aug 30 110 5 2
2026 Aug 31 105 5 2
2026 Sep 01 105 5 2
2026 Sep 02 105 5 2
2026 Sep 03 100 5 2
2026 Sep 04 95 15 3
2026 Sep 05 95 8 3
2026 Sep 06 90 5 2
2026 Sep 07 90 5 2
2026 Sep 08 95 5 2
2026 Sep 09 95 5 2
2026 Sep 10 100 5 2
2026 Sep 11 100 5 2
2026 Sep 12 105 5 2
(NOAA)
