Viewing archive of Friday, 13 December 2013
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 2013 Dec 13 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 347 Issued at 2200Z on 13 Dec 2013IA. Analysis of Solar Active Regions and Activity from 12-2100Z to 13-2100Z Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C5 event observed at
12/2214Z from Region 1921 (N07E23). There are currently 9 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 days one, two, and three (14 Dec, 15 Dec,
16 Dec).
IIA. Geophysical Activity Summary 12-2100Z to 13-2100Z
The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed,
as measured by the ACE spacecraft, reached a peak speed of 336 km/s at
13/1339Z. Total IMF reached 10 nT at 13/1838Z. The maximum southward
component of Bz reached -4 nT at 13/1314Z. Electrons greater than 2 MeV
at geosynchronous orbit reached a peak level of 1091 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to minor storm levels on day one (14 Dec), quiet to
active levels on day two (15 Dec) and quiet levels on day three (16
Dec).
III. Event Probabilities 14 Dec to 16 Dec
| Class M | 30% | 30% | 30% |
| Class X | 05% | 05% | 05% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 13 Dec 163 Predicted 14 Dec-16 Dec 160/160/155 90 Day Mean 13 Dec 136
V. Geomagnetic A Indices
Observed Afr/Ap 12 Dec 002/002 Estimated Afr/Ap 13 Dec 005/008 Predicted Afr/Ap 14 Dec-16 Dec 018/020-013/015-005/005
VI. Geomagnetic Activity Probabilities 14 Dec to 16 Dec
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 40% | 30% | 05% |
| Minor storm | 20% | 10% | 01% |
| Major-severe storm | 05% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 15% | 15% |
| Minor storm | 25% | 30% | 15% |
| Major-severe storm | 60% | 40% | 05% |
All times in UTC
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