Viewing archive of Friday, 19 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 19 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 353 Issued at 2200Z on 19 Dec 2014IA. Analysis of Solar Active Regions and Activity from 18-2100Z to 19-2100Z Solar activity has been at high levels for the past 24 hours.
The largest solar event of the period was a M6 event observed at
18/2158Z from Region 2241 (S09E04). There are currently 8 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be moderate
with a chance for X-class flares on days one, two, and three (20 Dec, 21
Dec, 22 Dec).
IIA. Geophysical Activity Summary 18-2100Z to 19-2100Z
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
422 km/s at 19/0130Z. Total IMF reached 8 nT at 19/1224Z. The maximum
southward component of Bz reached -7 nT at 19/0406Z. Electrons greater
than 2 MeV at geosynchronous orbit reached a peak level of 587 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to minor storm levels on days one and three (20 Dec, 22
Dec) and quiet to major storm levels on day two (21 Dec). Protons have a
slight chance of crossing threshold on days one, two, and three (20 Dec,
21 Dec, 22 Dec).
III. Event Probabilities 20 Dec to 22 Dec
| Class M | 75% | 75% | 75% |
| Class X | 25% | 25% | 25% |
| Proton | 20% | 20% | 20% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 19 Dec 216 Predicted 20 Dec-22 Dec 220/215/210 90 Day Mean 19 Dec 156
V. Geomagnetic A Indices
Observed Afr/Ap 18 Dec 005/004 Estimated Afr/Ap 19 Dec 009/010 Predicted Afr/Ap 20 Dec-22 Dec 015/018-023/035-015/018
VI. Geomagnetic Activity Probabilities 20 Dec to 22 Dec
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 40% | 30% | 40% |
| Minor storm | 20% | 30% | 20% |
| Major-severe storm | 05% | 20% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 25% | 25% | 25% |
| Major-severe storm | 60% | 65% | 60% |
All times in UTC
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