Viewing archive of Thursday, 26 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 26 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 146 Issued at 2200Z on 26 May 2011IA. Analysis of Solar Active Regions and Activity from 25-2100Z to 26-2100Z Solar activity was low. A fast emerging flux region
was numbered today as Region 1223 (S15E14). This region produced
two C-class events as it evolved. The first was a C1 at 25/2103Z
then followed by a second C1 at 25/2158Z. It is configured as a Cso
group with a beta magnetic classification.
IB. Solar Activity Forecast
Solar activity is expected to be very
low to low with a chance for a C-class event.
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
The geomagnetic field was mainly quiet with an active period reported
at 25/1800Z at mid-latitudes. Observations from the ACE spacecraft
indicated a possible co-rotating interaction region (CIR) at around
25/1330Z. Solar wind speed increased from around 340 to 390 km/s
and density jumped to 6 p/cc. Interplanetary magnetic field changes
included an increase in Bt to +7 nT, while Bz dipped to -6 nT.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be mostly unsettled with isolated active periods, and
isolated minor storms possible at high-latitudes, for the next three
days (27-29 May). Activity is expected due to a recurrent coronal
hole high speed stream. In addition, a disappearing filament
observed at 25/0801Z may possibly disturb the field on day two (28
May).
III. Event Probabilities 27 May to 29 May
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 26 May 083 Predicted 27 May-29 May 085/085/085 90 Day Mean 26 May 108
V. Geomagnetic A Indices
Observed Afr/Ap 25 May 002/004 Estimated Afr/Ap 26 May 005/007 Predicted Afr/Ap 27 May-29 May 010/010-015/015-010/012
VI. Geomagnetic Activity Probabilities 27 May to 29 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 25% | 20% |
| Minor storm | 05% | 10% | 05% |
| Major-severe storm | 01% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 35% | 30% |
| Minor storm | 10% | 15% | 10% |
| Major-severe storm | 05% | 05% | 05% |
All times in UTC
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