Viewing archive of Saturday, 15 April 2006
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 2006 Apr 15 2204 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 2006IA. Analysis of Solar Active Regions and Activity from 14-2100Z to 15-2100Z Solar activity was very low. Region 873 (S03W05)
produced a B1 flare at 15/1144Z.
IB. Solar Activity Forecast
Solar activity is expected to be very
low to low.
IIA. Geophysical Activity Summary 14-2100Z to 15-2100Z
The geomagnetic field ranged from unsettled to minor storm levels.
An interval of minor storm conditions was observed at the Boulder
magnetometer between 15/0600Z and 15/0900Z. The high speed solar
wind stream remains in effect. Solar wind speed peaked at around
730 km/s at approximately 15/1415Z, but has since been in decline.
The greater than 2 MeV electron flux at geosynchronous orbit reached
high levels today.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be unsettled to active, with isolated periods of minor
storm conditions, through 16 April. Predominantly unsettled
conditions are expected on 17 April. Quiet to unsettled levels will
return on 18 April.
III. Event Probabilities 16 Apr to 18 Apr
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 15 Apr 078 Predicted 16 Apr-18 Apr 080/075/075 90 Day Mean 15 Apr 080
V. Geomagnetic A Indices
Observed Afr/Ap 14 Apr 032/058 Estimated Afr/Ap 15 Apr 020/030 Predicted Afr/Ap 16 Apr-18 Apr 015/025-010/015-008/005
VI. Geomagnetic Activity Probabilities 16 Apr to 18 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 15% |
| Minor storm | 15% | 10% | 05% |
| Major-severe storm | 05% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 30% | 15% |
| Minor storm | 25% | 20% | 10% |
| Major-severe storm | 10% | 10% | 05% |
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