Product: Weekly Highlights and Forecasts
:Issued: 2025 Sep 22 0241 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 15 - 21 September 2025
.jpg)
Solar activity reached R1 (Minor) levels at 19/2141 UTC due to an impulsive M1.5/3n flare observed from Region 4216 (N10, L=246, class/area Dai/210). Low activity levels were observed on 15-18 Sep and 20-21 Sep. No significant CME activity was observed.
No proton events were observed at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit was at high levels from 16-21 Sep with a maximum flux of 6,210 pfu observed at 18/1655 UTC. Normal to moderate levels were observed on 15 Sep.
Geomagnetic field activity was at G1 (minor) levels on 15-16 Sep and at G3 (Strong) levels on 15 Sep due to CIR/ negative polarity CH HSS onset with possible influence from the 11 Sep CME. Quiet to unsettled levels were observed on 17 Sep as the negative polarity CH HSS waned. Quiet levels were observed on 18-21 Sep.
Forecast of Solar and Geomagnetic Activity 22 September - 18 October 2025
Solar activity is expected to be at low levels with a chance for isolated M-class flares throughout the outlook period.
No proton events are expected at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit is expected to be at high levels on 22-24 Sep, 30 Sep and 01 Oct, 06 -11 Oct and 13-18 Oct. Normal to moderate levels are expected for the remainder of the outlook period.
Geomagnetic field activity is expected to be at G1 (Minor) storm levels on 22 Sep due to influences from a negative polarity CH HSS. Unsettled to active levels are likely on 23 Sep. Unsettled to active levels are likely on 29-30 Sep, 03-07 Oct, 11-13 Oct and 18 Oct due to recurrent CH HSS influences. Quiet to unsettled levels are likely for the remaining days in the outlook period.
Product: 27-day Space Weather Outlook Table 27DO.txt
:Issued: 2025 Sep 22 0241 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 2025-09-22
#
# UTC Radio Flux Planetary Largest
# Date 10.7 cm A Index Kp Index
2025 Sep 22 180 24 5
2025 Sep 23 180 12 3
2025 Sep 24 185 5 2
2025 Sep 25 185 5 2
2025 Sep 26 175 5 2
2025 Sep 27 175 5 2
2025 Sep 28 170 5 2
2025 Sep 29 170 15 5
2025 Sep 30 170 8 3
2025 Oct 01 160 5 2
2025 Oct 02 150 5 2
2025 Oct 03 140 15 5
2025 Oct 04 140 12 4
2025 Oct 05 140 12 4
2025 Oct 06 140 15 5
2025 Oct 07 140 12 4
2025 Oct 08 135 8 3
2025 Oct 09 140 8 3
2025 Oct 10 140 5 2
2025 Oct 11 135 15 5
2025 Oct 12 135 12 4
2025 Oct 13 140 8 3
2025 Oct 14 140 5 2
2025 Oct 15 150 5 2
2025 Oct 16 160 5 2
2025 Oct 17 160 5 2
2025 Oct 18 160 10 3
(NOAA)
