Viewing archive of Monday, 18 December 2023
Solar activity report
Report of Solar-Geophysical Activity 2023 Dec 18 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 352 Issued at 2200Z on 18 Dec 2023IA. Analysis of Solar Active Regions and Activity from 17-2100Z to 18-2100Z Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C6 event observed at
18/1422Z from Region 3528 (N09E12). There are currently 9 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 (19 Dec) and expected to be low
with a slight chance for an M-class flare on days two and three (20 Dec,
21 Dec).
IIA. Geophysical Activity Summary 17-2100Z to 18-2100Z
The geomagnetic
field has been at unsettled to major storm levels for the past 24 hours.
Solar wind speed reached a peak of 581 km/s at 18/2036Z. Total IMF
reached 13 nT at 18/1036Z. The maximum southward component of Bz reached
-11 nT at 18/1034Z. Electrons greater than 2 MeV at geosynchronous
orbit reached a peak level of 102 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on days one and two (19 Dec, 20 Dec) and
quiet to unsettled levels on day three (21 Dec).
III. Event Probabilities 19 Dec to 21 Dec
| Class M | 25% | 20% | 20% |
| Class X | 05% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 18 Dec 161 Predicted 19 Dec-21 Dec 162/162/164 90 Day Mean 18 Dec 149
V. Geomagnetic A Indices
Observed Afr/Ap 17 Dec 032/044 Estimated Afr/Ap 18 Dec 017/027 Predicted Afr/Ap 19 Dec-21 Dec 014/015-010/012-007/010
VI. Geomagnetic Activity Probabilities 19 Dec to 21 Dec
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 25% | 15% |
| Minor storm | 10% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 20% | 20% | 15% |
| Major-severe storm | 20% | 20% | 10% |
All times in UTC
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