Viewing archive of Thursday, 27 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 27 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 362 Issued at 2200Z on 27 Dec 2012IA. Analysis of Solar Active Regions and Activity from 26-2100Z to 27-2100Z 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
27/0224Z from Region 1635 (N13W45). There are currently 5 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be low with a
slight Chance for an M-class flare on days one, two, and three (28 Dec,
29 Dec, 30 Dec).
IIA. Geophysical Activity Summary 26-2100Z to 27-2100Z
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 326 km/s at
27/0200Z. Total IMF reached 5.1 nT at 26/2206Z. The maximum southward
component of Bz reached -4.0 nT at 26/2227Z.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels for days one and two (28 Dec, 29 Dec)
due to effects from a weak coronal hole high speed stream. Quiet levels
are expected on day 3 (30 Dec).
III. Event Probabilities 28 Dec to 30 Dec
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 27 Dec 107 Predicted 28 Dec-30 Dec 110/110/110 90 Day Mean 27 Dec 118
V. Geomagnetic A Indices
Observed Afr/Ap 26 Dec 002/001 Estimated Afr/Ap 27 Dec 001/002 Predicted Afr/Ap 28 Dec-30 Dec 007/008-007/008-006/005
VI. Geomagnetic Activity Probabilities 28 Dec to 30 Dec
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 05% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 15% |
| Minor storm | 20% | 15% | 10% |
| Major-severe storm | 10% | 05% | 05% |
All times in UTC
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