Viewing archive of Thursday, 18 May 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 May 18 2204 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 138 Issued at 2200Z on 18 May 2006IA. Analysis of Solar Active Regions and Activity from 17-2100Z to 18-2100Z Solar activity was very low.
IB. Solar Activity Forecast
Solar activity is expected to be very
low.
IIA. Geophysical Activity Summary 17-2100Z to 18-2100Z
The geomagnetic field was at quiet to minor storm levels. Solar wind
speed at ACE showed an increase beginning around 18/0500 UTC as a
coronal hole high speed stream moved into geoeffective position.
Solar wind speed increased to around 600 km/s. An isolated minor
storm period occurred between 18/1500 and 18/1800 UTC.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to active with minor storm periods possible on
19 May due to continued coronal hole activity. On 20 and 21 May,
mostly quiet to unsettled conditions are expected.
III. Event Probabilities 19 May to 21 May
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 18 May 073 Predicted 19 May-21 May 075/075/075 90 Day Mean 18 May 081
V. Geomagnetic A Indices
Observed Afr/Ap 17 May 004/005 Estimated Afr/Ap 18 May 012/014 Predicted Afr/Ap 19 May-21 May 010/020-008/010-005/008
VI. Geomagnetic Activity Probabilities 19 May to 21 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 15% |
| Minor storm | 10% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 25% | 20% |
| Minor storm | 20% | 10% | 10% |
| Major-severe storm | 10% | 01% | 01% |
All times in UTC
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