Viewing archive of Friday, 31 December 2021
Solar activity report
Report of Solar-Geophysical Activity 2021 Dec 31 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 365 Issued at 2200Z on 31 Dec 2021IA. Analysis of Solar Active Regions and Activity from 30-2100Z to 31-2100Z Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C9 event observed at
31/0656Z from Region 2918 (N22W67). There are currently 4 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be low with a
slight chance for an M-class flare on day one (01 Jan) and expected to
be very low with a chance for a C-class flares and a slight chance for
an M-class flare on days two and three (02 Jan, 03 Jan).
IIA. Geophysical Activity Summary 30-2100Z to 31-2100Z
The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed
reached a peak of 472 km/s at 30/2226Z. Total IMF reached 7 nT at
31/2021Z. The maximum southward component of Bz reached -4 nT at
31/1419Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 340 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on days one and three (01 Jan, 03
Jan) and quiet to active levels on day two (02 Jan).
III. Event Probabilities 01 Jan to 03 Jan
| Class M | 20% | 10% | 10% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 31 Dec 102 Predicted 01 Jan-03 Jan 102/102/098 90 Day Mean 31 Dec 093
V. Geomagnetic A Indices
Observed Afr/Ap 30 Dec 007/006 Estimated Afr/Ap 31 Dec 004/005 Predicted Afr/Ap 01 Jan-03 Jan 007/008-011/012-007/008
VI. Geomagnetic Activity Probabilities 01 Jan to 03 Jan
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 35% | 25% |
| Minor storm | 10% | 15% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 30% | 30% | 30% |
| Major-severe storm | 40% | 50% | 40% |
All times in UTC
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