Viewing archive of Saturday, 7 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 07 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 127 Issued at 2200Z on 07 May 2011IA. Analysis of Solar Active Regions and Activity from 06-2100Z to 07-2100Z Solar activity has been very low. Region 1203 (N17W41)
and Region 1204 (N17W27) are the only remaining active spotted
regions. All other regions have decayed to spotless plage.
IB. Solar Activity Forecast
Solar activity is expected to be very
low to low during days one through three (08-10 May).
IIA. Geophysical Activity Summary 06-2100Z to 07-2100Z
The geomagnetic field was predominately quiet with isolate unsettled
conditions late in the period. The greater than 2 MeV electron flux
at geosynchronous orbit was at high levels throughout the period.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled on days one and two (08-09 May).
Day three is expected to be quiet to unsettled for most of the day,
with a chance for an isolated active period late in the day. The
increase in activity is forecast due to a coronal hole high speed
stream (CH-HSS) becoming geo-effective. The co-rotating interactive
region associated with this CH-HSS is expected to arrive between
10/1800Z-11/0600Z and maintains the possibility of causing isolated
minor storm conditions especially at high latitudes.
III. Event Probabilities 08 May to 10 May
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 07 May 102 Predicted 08 May-10 May 105/105/105 90 Day Mean 07 May 110
V. Geomagnetic A Indices
Observed Afr/Ap 06 May 003/004 Estimated Afr/Ap 07 May 004/005 Predicted Afr/Ap 08 May-10 May 005/005-005/005-008/008
VI. Geomagnetic Activity Probabilities 08 May to 10 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 05% | 05% | 10% |
| Minor storm | 01% | 01% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 15% |
| Minor storm | 01% | 01% | 10% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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