Viewing archive of Saturday, 27 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 27 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 361 Issued at 2200Z on 27 Dec 2014IA. Analysis of Solar Active Regions and Activity from 26-2100Z to 27-2100Z Solar activity has been at moderate levels for the past 24
hours. The largest solar event of the period was a M2 event observed at
27/0216Z from Region 2249 (S10W61). There are currently 5 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 and two (28 Dec, 29 Dec) and
likely to be low with a slight chance for an M-class flare on day three
(30 Dec).
IIA. Geophysical Activity Summary 26-2100Z to 27-2100Z
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
561 km/s at 26/2103Z. Total IMF reached 10 nT at 26/2300Z. The maximum
southward component of Bz reached -8 nT at 27/0040Z. Electrons greater
than 2 MeV at geosynchronous orbit reached a peak level of 252 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on days one, two, and three (28 Dec,
29 Dec, 30 Dec).
III. Event Probabilities 28 Dec to 30 Dec
| Class M | 25% | 25% | 20% |
| Class X | 05% | 05% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 27 Dec 134 Predicted 28 Dec-30 Dec 135/135/135 90 Day Mean 27 Dec 157
V. Geomagnetic A Indices
Observed Afr/Ap 26 Dec 015/015 Estimated Afr/Ap 27 Dec 009/011 Predicted Afr/Ap 28 Dec-30 Dec 008/010-007/010-007/010
VI. Geomagnetic Activity Probabilities 28 Dec to 30 Dec
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 20% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 20% |
| Minor storm | 30% | 30% | 30% |
| Major-severe storm | 30% | 25% | 25% |
All times in UTC
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