Product: Weekly Highlights and Forecasts
:Issued: 2026 Jan 05 0224 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 29 December - 04 January 2026
Solar activity ranged from low to high levels. High levels were observed on 31 Dec following an M7.1/1N flare at 31/1351 UTC from Region 4324 (N25, L=288, class/area=Dao/230 on 29 Dec). Associated with the event was Type IV and Type II radio sweeps, a Tenflare, and a CME signature to the NE in subsequent coronagraph imagery.
Modeling of the CME event suggested passage by Earth late on 03 Jan. Moderate levels were observed on 01 Jan following an M1/Sf flare at 29/0651 from Region 4325 (S08, L=296, class/area=Eki/330 on 01 Jan). The other 21 numbered active regions across the visible disk this week were either quiet or only produced C-class activity. A Type II radio sweep was reported on 02 Jan but was associated with a CME that erupted from beyond the W limb.
No proton events were observed at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit reached high levels over the past seven days.
Geomagnetic field activity was mostly at quiet to unsettled levels on day, but 02 Jan. G1 (Minor) geomagnetic storm levels were observed on late on 02 Jan, following the arrival of the last of a set of weak CMEs that left the Sun over 28-31 Dec. Total magnetic
field strength reached a peak of 09 nT as the CME passed. Bz reached as far south as -8 nT. Solar wind speeds peaked between ~600-700 km/s. While influence from a negative polarity coronal hole was observed beginning on 31 Dec, no significant geomagnetic activity was observed from the feature over the following days.
Forecast of Solar and Geomagnetic Activity 05 January - 31 January 2026
Solar activity is likely to remain at low levels, with a chance for moderate (R1-Minor) conditions and a slight chance for high (R2/R3-Moderate-Strong) over the next solar rotation due to multiple regions on the visible disk as well as regions expected to return from the Sun's farside.
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 05 Jan and 15 Jan - 13 Jan due to the anticipated influence of multiple, recurrent coronal holes. The remainder of the outlook period is likely to at normal to moderate levels.
Geomagnetic field activity is likely to reach G1 (Minor) geomagnetic storm levels on 13-14 Jan, 17-20 Jan, and 29 Jan; active levels are likely on 05 Jan and 28 Jan; unsettled levels are likely on 09-10 Jan, 12 Jan, 21-22 Jan, 27 Jan, and 30-31 Jan. All enhancements in geomagnetic activity are due to the anticipated influence of
multiple, recurrent, coronal holes. The remainder of the outlook period is expected to be mostly quiet.
Product: 27-day Space Weather Outlook Table 27DO.txt
:Issued: 2026 Jan 05 0224 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC web contact www.pc.noaa.gov/content/subscription-services
#
# 27-day Space Weather Outlook Table
# Issued 2026-01-05
#
# UTC Radio Flux Planetary Largest
# Date 10.7 cm A Index Kp Index
2026 Jan 05 155 10 3
2026 Jan 06 150 5 2
2026 Jan 07 145 5 2
2026 Jan 08 140 5 2
2026 Jan 09 135 8 3
2026 Jan 10 135 8 3
2026 Jan 11 130 5 2
2026 Jan 12 135 10 3
2026 Jan 13 135 15 5
2026 Jan 14 140 15 5
2026 Jan 15 145 5 2
2026 Jan 16 145 5 2
2026 Jan 17 145 20 5
2026 Jan 18 140 20 5
2026 Jan 19 145 18 5
2026 Jan 20 150 18 5
2026 Jan 21 155 8 3
2026 Jan 22 160 8 3
2026 Jan 23 165 6 2
2026 Jan 24 170 6 2
2026 Jan 25 175 6 2
2026 Jan 26 175 6 2
2026 Jan 27 170 8 3
2026 Jan 28 165 12 4
2026 Jan 29 160 20 5
2026 Jan 30 155 10 3
2026 Jan 31 160 8 3
(NOAA)
