Viewing archive of Saturday, 19 May 2007
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 2007 May 19 2203 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 139 Issued at 2200Z on 19 May 2007IA. Analysis of Solar Active Regions and Activity from 18-2100Z to 19-2100Z Solar activity was very low. Region 956 (N02W06)
produced several B-class flares during the past 24 hours, the
largest of which was a B9 flare at 19/1302Z. A disappearing solar
filament was observed from this region starting at 19/1231Z.
IB. Solar Activity Forecast
Solar acitivity is expected to be very
low to low.
IIA. Geophysical Activity Summary 18-2100Z to 19-2100Z
The geomagnetic field has been quiet to unsettled. The solar wind
speed remains elevated at approximately 600 km/s due to the coronal
hole high speed stream.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled with possible active periods
during local nighttime hours on 20 May. Expect mostly quiet
conditions on 21 - 22 May.
III. Event Probabilities 20 May to 22 May
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 19 May 075 Predicted 20 May-22 May 075/075/075 90 Day Mean 19 May 074
V. Geomagnetic A Indices
Observed Afr/Ap 18 May 015/018 Estimated Afr/Ap 19 May 010/015 Predicted Afr/Ap 20 May-22 May 008/010-005/005-005/005
VI. Geomagnetic Activity Probabilities 20 May to 22 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 15% |
| Minor storm | 05% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 15% | 15% |
| Minor storm | 15% | 05% | 05% |
| Major-severe storm | 05% | 01% | 01% |
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