Viewing archive of Saturday, 25 February 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 Feb 25 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 056 Issued at 2200Z on 25 Feb 2012IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z
Solar activity was very low. Umbral separation was
observed in Region 1422 (N15W78). Slight decay was observed in the
trailing spots of Region 1424 (N08E52). The rest of the spot groups
were relatively quiet and stable. A filament eruption on the SE
limb was observed in SDO/AIA 304 imagery beginning at 24/1911Z. A
corresponding CME off the SE limb was observed in LASCO C2 imagery
beginning at 24/1948Z. The CME is not expected to be geoeffective.
IB. Solar Activity Forecast
Solar activity is expected to be very
low with a chance for C-class activity for the next three days (26 -
28 February).
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
The geomagnetic field was at quiet to unsettled levels. Isolated
major storm conditions were observed at high latitudes (College)
during the periods ending at 25/1200Z and 25/1500Z. A greater than
10 MeV proton enhancement began at approximately 25/0330Z and
reached a maximum of 3 pfu at 25/1830Z and continued to be enhanced
by the end of the reporting period. The event did not reach event
threshold and likely originated from a backside event.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be mostly quiet on day 1 (26 February). Early on day 2
(27 February), unsettled to active conditions are expected with
minor storm periods possible due to the expected arrival of the 24
February CME. Conditions are expected to calm to quiet to unsettled
levels with active periods possible by day 3 (28 February).
III. Event Probabilities 26 Feb to 28 Feb
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 25 Feb 108 Predicted 26 Feb-28 Feb 100/100/100 90 Day Mean 25 Feb 129
V. Geomagnetic A Indices
Observed Afr/Ap 24 Feb 006/004 Estimated Afr/Ap 25 Feb 004/006 Predicted Afr/Ap 26 Feb-28 Feb 004/005-011/015-010/010
VI. Geomagnetic Activity Probabilities 26 Feb to 28 Feb
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 05% | 25% | 20% |
| Minor storm | 01% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 30% | 25% |
| Minor storm | 10% | 25% | 20% |
| Major-severe storm | 05% | 15% | 10% |
All times in UTC
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