Viewing archive of Monday, 17 December 2012
Solar activity report
Any mentioned solar flare in this report has a scaling factor applied by the Space Weather Prediction Center (SWPC). Because of the SWPC scaling factor, solar flares are reported as 42% smaller than for the science quality data. The scaling factor has been removed from our archived solar flare data to reflect the true physical units.
Report of Solar-Geophysical Activity 2012 Dec 17 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 17 Dec 2012IA. Analysis of Solar Active Regions and Activity from 16-2100Z to 17-2100Z Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C1 event observed at
17/0220Z from Region 1629 (N13W88). There are currently 5 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be at low
levels with a slight chance for M-class flares on days one, two, and
three (18 Dec, 19 Dec, 20 Dec).
IIA. Geophysical Activity Summary 16-2100Z to 17-2100Z
The geomagnetic
field has been at quiet to active levels for the past 24 hours. Solar
wind speed, as measured by the ACE spacecraft, reached a peak speed of
532 km/s at 17/1237Z. Total IMF reached 9.6 nT at 17/0740Z. The maximum
southward component of Bz reached -7.4 nT at 17/1102Z. Electrons greater
than 2 MeV at geosynchronous orbit reached a peak level of 155 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on day one (18 Dec) and a return to
predominantly quiet levels for days two and three (19 Dec and 20 Dec).
III. Event Probabilities 18 Dec to 20 Dec
| Class M | 15% | 15% | 15% |
| Class X | 01% | 01% | 01% |
| Proton | 05% | 05% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 17 Dec 115 Predicted 18 Dec-20 Dec 120/125/125 90 Day Mean 17 Dec 120
V. Geomagnetic A Indices
Observed Afr/Ap 16 Dec 005/006 Estimated Afr/Ap 17 Dec 010/012 Predicted Afr/Ap 18 Dec-20 Dec 012/012-008/010-005/005
VI. Geomagnetic Activity Probabilities 18 Dec to 20 Dec
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 10% | 05% |
| Minor storm | 05% | 05% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 20% | 25% | 15% |
| Major-severe storm | 20% | 20% | 05% |
All times in UTC
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