Viewing archive of Wednesday, 25 May 2011
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 2011 May 25 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 145 Issued at 2200Z on 25 May 2011IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z Solar activity was very low. Only low level B-class
events were observed during the period. Region 1220 (N12, L=249)
produced a long duration B2 event at 24/2237Z prior to its rotation
around the west limb. Region 1218 (S16W28) also produced B-class
events with frequent point brightenings within the region. This
region remains a spotless plage. A nine degree filament located at
N44E37 disappeared between 25/0801-1256Z. A further analysis of
this event will be performed as image data updates for any
associated CME activity. New Region 1222 (N15W24) was numbered
today.
IB. Solar Activity Forecast
Solar activity is expected to be very
low.
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
The geomagnetic field was quiet. Solar wind speeds observed by the
ACE spacecraft have averaged around 380 km/s through the period with
occasional minor fluctuations in the IMF Bz between -4/+5 nT.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be mostly quiet on day one (26 May). Quiet to unsettled
conditions, with isolated active levels, are expected for days two
and three (27-28 May) as a recurrent coronal hole high speed stream
becomes geo-effective.
III. Event Probabilities 26 May to 28 May
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 25 May 080 Predicted 26 May-28 May 080/080/080 90 Day Mean 25 May 108
V. Geomagnetic A Indices
Observed Afr/Ap 24 May 005/006 Estimated Afr/Ap 25 May 003/005 Predicted Afr/Ap 26 May-28 May 005/008-010/012-015/015
VI. Geomagnetic Activity Probabilities 26 May to 28 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 05% | 20% | 25% |
| Minor storm | 01% | 05% | 10% |
| Major-severe storm | 01% | 01% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 30% | 35% |
| Minor storm | 05% | 10% | 15% |
| Major-severe storm | 01% | 05% | 05% |
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