Viewing archive of Saturday, 21 December 2024
Solar activity report
Report of Solar-Geophysical Activity 2024 Dec 21 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 356 Issued at 2200Z on 21 Dec 2024IA. Analysis of Solar Active Regions and Activity from 20-2100Z to 21-2100Z Solar activity has been at moderate levels for the past 24
hours. The largest solar event of the period was a M1 event observed at
21/0038Z from Region 3932 (S17E56). There are currently 10 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be moderate
with a slight chance for an X-class flare on days one, two, and three
(22 Dec, 23 Dec, 24 Dec).
IIA. Geophysical Activity Summary 20-2100Z to 21-2100Z
The geomagnetic
field has been at quiet to active levels for the past 24 hours. Solar
wind speed reached a peak of 569 km/s at 21/0842Z. Total IMF reached 9
nT at 21/0206Z. The maximum southward component of Bz reached -8 nT at
21/2058Z. Protons greater than 10 MeV at geosynchronous orbit reached a
peak level of 5 pfu at 21/1820Z. Electrons greater than 2 MeV at
geosynchronous orbit reached a peak level of 756 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet levels on day one (22 Dec) and quiet to unsettled levels
on days two and three (23 Dec, 24 Dec).
III. Event Probabilities 22 Dec to 24 Dec
| Class M | 60% | 60% | 60% |
| Class X | 10% | 10% | 10% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 21 Dec 195 Predicted 22 Dec-24 Dec 190/190/190 90 Day Mean 21 Dec 201
V. Geomagnetic A Indices
Observed Afr/Ap 20 Dec 010/011 Estimated Afr/Ap 21 Dec 011/014 Predicted Afr/Ap 22 Dec-24 Dec 005/008-008/008-009/010
VI. Geomagnetic Activity Probabilities 22 Dec to 24 Dec
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 20% | 25% | 25% |
| Major-severe storm | 15% | 25% | 25% |
All times in UTC
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Space weather facts
| Last X-flare | 2024/12/08 | X2.2 |
| Last M-flare | 2024/12/21 | M1.9 |
| Last geomagnetic storm | 2024/12/17 | Kp5+ (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| November 2024 | 152.5 -13.9 |
| December 2024 | 100.9 -51.6 |
| Last 30 days | 114.1 -42.1 |