Viewing archive of Tuesday, 20 April 2010
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 2010 Apr 20 2201 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 110 Issued at 2200Z on 20 Apr 2010IA. Analysis of Solar Active Regions and Activity from 19-2100Z to 20-2100Z Solar activity was very low. No flares were observed
during the last 24 hours and the disk remained spotless.
IB. Solar Activity Forecast
Solar activity is expected to remain
very low for the next three days (21-23 April).
IIA. Geophysical Activity Summary 19-2100Z to 20-2100Z
The geomagnetic field was quiet during the last 24 hours.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled with a slight chance for isolated
active periods for the next three days (21-23 April). The increase
in activity is associated with several CMEs (observed on 15, 18 and
19 April) and a coronal hole high speed stream rotating into a
geoeffective position.
III. Event Probabilities 21 Apr to 23 Apr
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 20 Apr 076 Predicted 21 Apr-23 Apr 080/082/084 90 Day Mean 20 Apr 082
V. Geomagnetic A Indices
Observed Afr/Ap 19 Apr 003/005 Estimated Afr/Ap 20 Apr 003/005 Predicted Afr/Ap 21 Apr-23 Apr 010/012-012/015-010/012
VI. Geomagnetic Activity Probabilities 21 Apr to 23 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 25% | 20% |
| Minor storm | 05% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 30% | 25% |
| Minor storm | 10% | 15% | 10% |
| Major-severe storm | 05% | 05% | 05% |
All times in UTC
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