Viewing archive of Sunday, 19 April 2009
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 2009 Apr 19 2201 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 109 Issued at 2200Z on 19 Apr 2009IA. Analysis of Solar Active Regions and Activity from 18-2100Z to 19-2100Z Solar activity was very low. No flares were observed.
The visible disk remains spotless.
IB. Solar Activity Forecast
Solar activity is expected to be very
low.
IIA. Geophysical Activity Summary 18-2100Z to 19-2100Z
The geomagnetic field was quiet. Observations from the ACE
spacecraft show solar wind speeds gradually decayed through the
period from about 540 km/s to near 450 km/s as the coronal hole high
speed stream waned.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be mostly quiet for 20 April. Quiet to unsettled levels
are expected for 21 - 22 April due to a recurrent enhancement in
solar wind velocities.
III. Event Probabilities 20 Apr to 22 Apr
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 19 Apr 070 Predicted 20 Apr-22 Apr 070/070/070 90 Day Mean 19 Apr 070
V. Geomagnetic A Indices
Observed Afr/Ap 18 Apr 008/008 Estimated Afr/Ap 19 Apr 005/005 Predicted Afr/Ap 20 Apr-22 Apr 005/005-008/008-007/007
VI. Geomagnetic Activity Probabilities 20 Apr to 22 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 05% | 15% | 10% |
| Minor storm | 01% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 05% | 15% | 10% |
| Minor storm | 01% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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