Viewing archive of Monday, 4 April 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 Apr 04 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 094 Issued at 2200Z on 04 Apr 2011IA. Analysis of Solar Active Regions and Activity from 03-2100Z to 04-2100Z Solar activity was very low. New Region 1185 (N23E72)
was numbered today. Multiple CMEs were observed by Stereo Ahead
COR2 imagery. A long duration B-class event was associated with the
CME that lifted off of the Northeast limb at approximately 04/0509Z.
IB. Solar Activity Forecast
Solar activity is expected to be very
low to low with a slight chance for moderate activity (isolated
M-class event) from Region 1183 (N16W38) for the next three days (05
- 07 April).
IIA. Geophysical Activity Summary 03-2100Z to 04-2100Z
The geomagnetic field was at quiet to unsettled levels. ACE solar
wind data showed wind speeds decreasing from approximately 600 km/s
to approximately 460/km/s as the coronal hole high speed stream (CH
HSS) effects wane. The greater than 2 MeV electron flux at
geosynchronous orbit was at high levels throughout the period.
IIB. Geophysical Activity Forecast
Geomagnetic field activity is
expected to be mostly quiet on days one and two (05 - 06 April).
Activity is expected to increase to quiet to unsettled levels with
isolated active periods on day three (07 April) in response to
coronal hole effects. The CME mentioned above is not expected to be
geo-effective.
III. Event Probabilities 05 Apr to 07 Apr
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 04 Apr 113 Predicted 05 Apr-07 Apr 105/105/100 90 Day Mean 04 Apr 099
V. Geomagnetic A Indices
Observed Afr/Ap 03 Apr 011/016 Estimated Afr/Ap 04 Apr 008/010 Predicted Afr/Ap 05 Apr-07 Apr 005/005-005/005-008/008
VI. Geomagnetic Activity Probabilities 05 Apr to 07 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 20% |
| Minor storm | 01% | 01% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 25% |
| Minor storm | 01% | 01% | 10% |
| Major-severe storm | 01% | 01% | 01% |
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