Viewing archive of Wednesday, 17 December 2014
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 2014 Dec 17 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 351 Issued at 2200Z on 17 Dec 2014IA. Analysis of Solar Active Regions and Activity from 16-2100Z to 17-2100Z Solar activity has been at high levels for the past 24 hours.
The largest solar event of the period was a M8 event observed at
17/0451Z from Region 2242 (S18W01). There are currently 9 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be moderate
with a slight chance for an X-class flare 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 unsettled levels for the past 24 hours. Solar
wind speed, as measured by the ACE spacecraft, reached a peak speed of
454 km/s at 17/0219Z. Total IMF reached 6 nT at 17/1503Z. The maximum
southward component of Bz reached -5 nT at 17/0248Z. Electrons greater
than 2 MeV at geosynchronous orbit reached a peak level of 653 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on day one (18 Dec) and quiet to
active levels on days two and three (19 Dec, 20 Dec). Protons have a
slight chance of crossing threshold on days one, two, and three (18 Dec,
19 Dec, 20 Dec).
III. Event Probabilities 18 Dec to 20 Dec
| Class M | 65% | 65% | 65% |
| Class X | 15% | 15% | 15% |
| Proton | 15% | 15% | 15% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 17 Dec 192 Predicted 18 Dec-20 Dec 190/190/185 90 Day Mean 17 Dec 154
V. Geomagnetic A Indices
Observed Afr/Ap 16 Dec 007/006 Estimated Afr/Ap 17 Dec 008/009 Predicted Afr/Ap 18 Dec-20 Dec 007/008-010/010-014/015
VI. Geomagnetic Activity Probabilities 18 Dec to 20 Dec
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 30% | 30% |
| Minor storm | 05% | 15% | 15% |
| Major-severe storm | 01% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 25% | 30% | 30% |
| Major-severe storm | 20% | 50% | 50% |
All times in UTC
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