Viewing archive of Wednesday, 15 December 2021
Solar activity report
Report of Solar-Geophysical Activity 2021 Dec 15 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 349 Issued at 2200Z on 15 Dec 2021IA. Analysis of Solar Active Regions and Activity from 14-2100Z to 15-2100Z
Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C8 event observed at
15/1044Z from Region 2907 (S21E39). There are currently 5 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 (16 Dec) and likely to be low
with a slight chance for an M-class flare on days two and three (17 Dec,
18 Dec).
IIA. Geophysical Activity Summary 14-2100Z to 15-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 568 km/s at 15/1236Z. Total IMF reached 16
nT at 15/0517Z. The maximum southward component of Bz reached -14 nT at
15/0517Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 152 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on days one and two (16 Dec, 17 Dec)
and quiet levels on day three (18 Dec).
III. Event Probabilities 16 Dec to 18 Dec
| Class M | 25% | 20% | 15% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 15 Dec 103 Predicted 16 Dec-18 Dec 102/102/102 90 Day Mean 15 Dec 087
V. Geomagnetic A Indices
Observed Afr/Ap 14 Dec 004/004 Estimated Afr/Ap 15 Dec 009/011 Predicted Afr/Ap 16 Dec-18 Dec 008/008-008/008-006/005
VI. Geomagnetic Activity Probabilities 16 Dec to 18 Dec
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 15% | 10% |
| Minor storm | 05% | 05% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 30% | 25% | 20% |
| Major-severe storm | 30% | 25% | 20% |
All times in UTC
Current data suggests there is a slight possibility for aurora to appear at the following high latitude regions in the near future
Whitehorse, YTAnchorage, AK, Fairbanks, AK, Juneau, AK
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