Viewing archive of Friday, 15 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 15 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 105 Issued at 2200Z on 15 Apr 2011IA. Analysis of Solar Active Regions and Activity from 14-2100Z to 15-2100Z Solar activity increased to moderate levels. Region
1190 (N13W26) produced an M1/1F flare at 15/1712Z. Associated with
this event were discrete radio emissions ranging from 4995 MHz -
15400 MHz. Occasional C-class flares were also observed during the
period. Region 1190 and Region 1193 (N17E44) remain the most
significant regions. Both Regions 1190 and 1193 showed increases in
areal coverage. A filament was observed lifting at 14/2324Z on GOES
SXI. A CME was observed on SOHO/LASCO C2 imagery at 15/0036Z, with a
speed of approximately 390 km/s. STEREO imagery showed the CME is
expected to be geoeffective.
IB. Solar Activity Forecast
Solar activity is expected to be at
low levels, with C-class flares expected for the next three days
(16-18 April). There is also a slight chance for M-class flares
during the period.
IIA. Geophysical Activity Summary 14-2100Z to 15-2100Z
The geomagnetic field was at quiet levels. The greater than 2 MeV
electron flux at geosynchronous orbit reached high levels during the
period.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be predominantly quiet for the next three days (16-18
April).
III. Event Probabilities 16 Apr to 18 Apr
| Class M | 55% | 55% | 55% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 15 Apr 129 Predicted 16 Apr-18 Apr 135/140/145 90 Day Mean 15 Apr 103
V. Geomagnetic A Indices
Observed Afr/Ap 14 Apr 003/007 Estimated Afr/Ap 15 Apr 003/005 Predicted Afr/Ap 16 Apr-18 Apr 005/005-005/005-005/005
VI. Geomagnetic Activity Probabilities 16 Apr to 18 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 05% | 05% | 05% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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