Product: Weekly Highlights and Forecasts
:Issued: 2025 Dec 29 0129 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 22 - 28 December 2025
Solar activity was at low levels with C-flare activity observed over 22-26 Dec. Solar activity reached high levels on 27 Dec when Region 4325 (S09, L=294, class/area=Dao/100 on 27 Dec) produced an M5.1 flare (R2-Moderate), with Type-II radio sweep (788 km/s), at 27/0150 UTC. Solar activity reached moderate levels on 28 Dec when Region 4325 produced an impulsive M1.3/Sf flare (R1-Minor) at 28/2113 UTC, and Region 4317 (N10, L=09, class/area=Eki/260 on 23 Dec) produced an M4.2/1f flare (R1), with a 300 sfu Tenflare, at 27/2239 UTC. No Earth-directed CMEs were observed during the week, though no coronagraph imagery covering the late 28 Dec flare activity was available at the time of writing.
No proton events were observed at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit reached high levels each day of the 22-28 Dec period.
Geomagnetic field activity reached G1 (Minor) storm levels on 22 Dec, with active periods observed on 23-24 Dec, due to positive polarity CH HSS influences. Quiet to unsettled conditions prevailed on 25-28 Dec as positive polarity CH HSS influences slowly diminished.
Forecast of Solar and Geomagnetic Activity 29 December - 24 January 2026
Solar activity is expected to be predominately low through 24 Jan, with C-class flares expected throughout the outlook period. M-class flares (R1-R2/Minor-Moderate) range from a chance to likely at times as active regions evolve and rotate on/off the disk. X-class flares (R3-Strong or greater) range from a slight chance to a chance during periods of enhanced active region complexity.
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 29-31 Dec, 03-06 and 14-24 Jan. Normal to moderate levels are expected to prevail throughout the remainder of the 29 Dec-24 Jan period.
Geomagnetic field activity is likely to reach active levels on 01 Jan in response to negative polarity CH HSS influences, and again over 02-04 Jan following the onset of positive polarity CH HSS influences. Periods of active conditions are likely on 09-10 and 12-14 Jan due to negative polarity CH HSS influences. Periods of G1
(Minor) storming are likely on 17-18 Jan, with active conditions likely on 19-20 Jan, associated with positive polarity CH HSS influences.
:Product: 27-day Space Weather Outlook Table 27DO.txt
:Issued: 2025 Dec 29 0130 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 2025-12-29
#
# UTC Radio Flux Planetary Largest
# Date 10.7 cm A Index Kp Index
2025 Dec 29 185 5 2
2025 Dec 30 175 5 2
2025 Dec 31 170 8 3
2026 Jan 01 165 15 4
2026 Jan 02 160 18 4
2026 Jan 03 160 15 4
2026 Jan 04 155 12 4
2026 Jan 05 150 5 2
2026 Jan 06 155 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
2026 Jan 18 135 20 5
2026 Jan 19 145 18 4
2026 Jan 20 155 18 4
2026 Jan 21 165 8 3
2026 Jan 22 165 8 3
2026 Jan 23 175 5 2
2026 Jan 24 175 5 2
(NOAA)
