Viewing archive of Sunday, 17 December 2023
Solar activity report
Report of Solar-Geophysical Activity 2023 Dec 17 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 351 Issued at 2200Z on 17 Dec 2023IA. Analysis of Solar Active Regions and Activity from 16-2100Z to 17-2100Z 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
17/2017Z from Region 3514 (N05W94). There are currently 8 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be low with
a chance for M-class flares on day one (18 Dec) and expected to be low
with a slight chance for an M-class flare on days two and three (19 Dec,
20 Dec).
IIA. Geophysical Activity Summary 16-2100Z to 17-2100Z
The geomagnetic
field has been at unsettled to minor storm levels for the past 24 hours.
Solar wind speed reached a peak of 565 km/s at 17/0955Z. Total IMF
reached 16 nT at 17/1439Z. The maximum southward component of Bz reached
-14 nT at 17/1505Z. Electrons greater than 2 MeV at geosynchronous
orbit reached a peak level of 147 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to minor storm levels on day one (18 Dec) and quiet to
active levels on days two and three (19 Dec, 20 Dec).
III. Event Probabilities 18 Dec to 20 Dec
| Class M | 25% | 10% | 10% |
| Class X | 05% | 01% | 01% |
| Proton | 05% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 17 Dec 155 Predicted 18 Dec-20 Dec 147/145/140 90 Day Mean 17 Dec 149
V. Geomagnetic A Indices
Observed Afr/Ap 16 Dec 010/011 Estimated Afr/Ap 17 Dec 025/035 Predicted Afr/Ap 18 Dec-20 Dec 013/015-013/015-011/012
VI. Geomagnetic Activity Probabilities 18 Dec to 20 Dec
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 25% | 25% |
| Minor storm | 15% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 20% | 20% | 20% |
| Major-severe storm | 20% | 20% | 25% |
All times in UTC
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| Last X-flare | 2024/11/06 | X2.3 |
| Last M-flare | 2024/11/08 | M1.4 |
| Last geomagnetic storm | 2024/10/12 | Kp5 (G1) |
| Spotless days | |
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| Monthly mean Sunspot Number | |
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