Product: Weekly Highlights and Forecasts
:Issued: 2025 Dec 22 0335 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 December 2025
Solar activity reached high levels on 19-21 Dec. There were three M1 flares from an unnumbered region beyond the east limb, Region 4315 (N19E58, L=35, class/area Bxo/10 on 20 Dec) and Region 4316 (S07E28, L=45, class/area Dsi/50 on 21 Dec. Low levels with only C-class activity was observed on 15-18 Dec. These two numbered regions also produced numerous C-class flares. No significant CME activity was observed on the Earth-facing disk.
No proton events were observed at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit reached high levels on 17-21 Dec due to coronal hole high speed stream influences. Normal to moderate levels were observed on 15-16 Dec.
Geomagnetic field activity reached G1 (Minor) storm levels on 17 and 21 Dec due to CH HSS influences. Active levels were observed on 18 Dec. Quiet to unsettled levels were observed on 15-16, and 19-20 Dec.
Forecast of Solar and Geomagnetic Activity 22 December - 17 January 2026
Solar activity is expected to be at low to moderate levels for 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 25-29 Dec, 1-6 Jan, and 14-17 Jan. All due to recurrent CH HSS influences.
Geomagnetic field activity is expected to be at G2 (Moderate) storm levels on 30 Dec; G1 (Minor) storm levels are expected on 22-23 Dec, 31 Dec, and 17 Jan, active levels are expected on 24-25 Dec, 01-02 Jan, 09-10 Jan, and 12-14 Jan. All due to recurrent CH HSS influences.
:Product: 27-day Space Weather Outlook Table 27DO.txt
:Issued: 2025 Dec 22 0335 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC cweb ontact www.swpc.noaa.gov/content/subscription-services
#
# 27-day Space Weather Outlook Table
# Issued 2025-12-22
#
# UTC Radio Flux Planetary Largest
# Date 10.7 cm A Index Kp Index
2025 Dec 22 130 28 5
2025 Dec 23 135 22 5
2025 Dec 24 140 20 4
2025 Dec 25 145 15 4
2025 Dec 26 150 10 3
2025 Dec 27 155 5 2
2025 Dec 28 155 5 2
2025 Dec 29 160 8 3
2025 Dec 30 170 30 6
2025 Dec 31 170 25 5
2026 Jan 01 165 10 4
2026 Jan 02 160 10 4
2026 Jan 03 160 8 3
2026 Jan 04 160 5 2
2026 Jan 05 160 5 2
2026 Jan 06 160 5 2
2026 Jan 07 140 5 2
2026 Jan 08 130 5 2
2026 Jan 09 125 15 4
2026 Jan 10 120 10 4
2026 Jan 11 120 5 2
2026 Jan 12 120 10 4
2026 Jan 13 120 15 4
2026 Jan 14 115 15 4
2026 Jan 15 120 5 2
2026 Jan 16 120 5 2
2026 Jan 17 125 20 5
(NOAA)
