Viewing archive of Friday, 19 December 2025
Solar activity report
Report of Solar-Geophysical Activity 2025 Dec 19 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 353 Issued at 2200Z on 19 Dec 2025IA. Analysis of Solar Active Regions and Activity from 18-2100Z to 19-2100Z Solar activity has been at moderate levels for the past 24
hours. There are currently 3 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be low on days
one, two, and three (20 Dec, 21 Dec, 22 Dec).
IIA. Geophysical Activity Summary 18-2100Z to 19-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 906 km/s at 18/2313Z. Total IMF reached 5
nT at 19/0537Z. The maximum southward component of Bz reached -4 nT at
19/0054Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 3239 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on day one (20 Dec), quiet levels on
day two (21 Dec) and quiet to minor storm levels on day three (22 Dec).
III. Event Probabilities 20 Dec to 22 Dec
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 19 Dec 118 Predicted 20 Dec-22 Dec 118/116/116 90 Day Mean 19 Dec 149
V. Geomagnetic A Indices
Observed Afr/Ap 18 Dec 011/017 Estimated Afr/Ap 19 Dec 006/007 Predicted Afr/Ap 20 Dec-22 Dec 008/008-005/005-014/018
VI. Geomagnetic Activity Probabilities 20 Dec to 22 Dec
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 10% | 35% |
| Minor storm | 05% | 01% | 30% |
| Major-severe storm | 01% | 01% | 10% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 10% |
| Minor storm | 25% | 20% | 25% |
| Major-severe storm | 25% | 10% | 65% |
All times in UTC
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| Last X-flare | 2026/04/24 | X2.5 |
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| Spotless days | |
|---|---|
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| 2026 | 3 days (2%) |
| Last spotless day | 2026/02/24 |
| Monthly mean Sunspot Number | |
|---|---|
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