Viewing archive of Sunday, 15 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 15 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 135 Issued at 2200Z on 15 May 2011IA. Analysis of Solar Active Regions and Activity from 14-2100Z to 15-2100Z Solar activity was low during the past 24 hours. Region
1208 (N11W48) produced an isolated C1/Sf at 15/1620Z. This region
grew in area and is classified as an Eso type sunspot group. Region
1214 (S21E01) grew but remained a simple magnetic bi-polar group.
IB. Solar Activity Forecast
Solar activity is expected to be very
low to low during the next three days (16-18 May).
IIA. Geophysical Activity Summary 14-2100Z to 15-2100Z
The geomagnetic field was quiet to active during the past 24 hours.
Observations from the ACE spacecraft indicate the onset of a coronal
hole high speed stream (CH HSS). Solar wind velocities increased
throughout the period to about 590 km/s.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be predominately quiet to unsettled, with a slight
chance for isolated active periods on days one and two (16-17 May).
Day three (18 May) is expected to be quiet as the CH HSS subsides.
III. Event Probabilities 16 May to 18 May
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 15 May 095 Predicted 16 May-18 May 092/092/090 90 Day Mean 15 May 110
V. Geomagnetic A Indices
Observed Afr/Ap 14 May 003/004 Estimated Afr/Ap 15 May 011/011 Predicted Afr/Ap 16 May-18 May 008/008-008/008-005/005
VI. Geomagnetic Activity Probabilities 16 May to 18 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 05% |
| Minor storm | 05% | 05% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 10% |
| Minor storm | 10% | 10% | 01% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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