Viewing archive of Thursday, 19 May 2005
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 2005 May 19 2210 UTC# Prepared jointly by the U.S. Dept. of Commerce, NOAA, #Space Environment Center and the U.S. Air Force. #
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 139 Issued at 2200Z on 19 May 2005IA. Analysis of Solar Active Regions and Activity from 18-2100Z to 19-2100Z Solar activity was at very low levels. Region 759
(N12W75) has decayed into a single HHX alpha spot group as it nears
the solar west limb. Region 763 (S16W35) underwent further decay
this period and is now a simple BXO beta spot group. Region 765
(N09E65) was numbered today.
IB. Solar Activity Forecast
Solar activity is expected to be at
very low levels.
IIA. Geophysical Activity Summary 18-2100Z to 19-2100Z
The geomagnetic field was at quiet to unsettled levels. The greater
than 2 MeV electron flux at geosynchronous orbit reached very high
levels today.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be at predominantly quiet to unsettled levels throughout
the period. Isolated active periods are possible on 20 May due to a
slight chance of the CME seen on 17 May becoming geoeffective.
III. Event Probabilities 20 May to 22 May
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 19 May 085 Predicted 20 May-22 May 080/080/085 90 Day Mean 19 May 092
V. Geomagnetic A Indices
Observed Afr/Ap 18 May 006/013 Estimated Afr/Ap 19 May 005/010 Predicted Afr/Ap 20 May-22 May 008/015-005/010-005/008
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 | 30% | 20% | 15% |
| Minor storm | 15% | 05% | 05% |
| Major-severe storm | 05% | 01% | 01% |
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