Viewing archive of Thursday, 16 December 2021
Solar activity report
Report of Solar-Geophysical Activity 2021 Dec 16 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 350 Issued at 2200Z on 16 Dec 2021IA. Analysis of Solar Active Regions and Activity from 15-2100Z to 16-2100Z Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C3 event observed at
16/1527Z from Region 2909 (S21E58). There are currently 7 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 (17 Dec) and likely to be low
with a slight chance for an M-class flare on days two and three (18 Dec,
19 Dec).
IIA. Geophysical Activity Summary 15-2100Z to 16-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 558 km/s at 16/1123Z. Total IMF reached 7
nT at 16/0932Z. The maximum southward component of Bz reached -5 nT at
16/0942Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 154 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on day one (17 Dec) and quiet levels
on days two and three (18 Dec, 19 Dec).
III. Event Probabilities 17 Dec to 19 Dec
| Class M | 25% | 20% | 15% |
| Class X | 05% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 16 Dec 118 Predicted 17 Dec-19 Dec 118/118/118 90 Day Mean 16 Dec 087
V. Geomagnetic A Indices
Observed Afr/Ap 15 Dec 008/006 Estimated Afr/Ap 16 Dec 009/008 Predicted Afr/Ap 17 Dec-19 Dec 008/008-006/005-006/005
VI. Geomagnetic Activity Probabilities 17 Dec to 19 Dec
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 10% | 10% |
| Minor storm | 05% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 25% | 20% | 20% |
| Major-severe storm | 25% | 20% | 15% |
All times in UTC
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