Viewing archive of Thursday, 31 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 31 2203 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 151 Issued at 2200Z on 31 May 2007IA. Analysis of Solar Active Regions and Activity from 30-2100Z to 31-2100Z Solar activity remained at low levels. Region 958
(S13E35) continues to decay. A C1 x-ray flare occurred at 31/1253Z,
and appeared to have come from a source region just beyond the east
limb. No new regions were numbered today.
IB. Solar Activity Forecast
Solar activity is expected to be at
very low to low levels.
IIA. Geophysical Activity Summary 30-2100Z to 31-2100Z
The geomagnetic field was at quiet levels. The greater than 2 MeV
electron flux at geosynchronous orbit reached high levels again
today.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be at predominantly quiet levels on 01 and 02 June. A
recurrent coronal hole high speed stream is expected to become
geoeffective on 03 June. Active conditions are possible with the
onset of the coronal hole.
III. Event Probabilities 01 Jun to 03 Jun
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 31 May 075 Predicted 01 Jun-03 Jun 075/075/075 90 Day Mean 31 May 073
V. Geomagnetic A Indices
Observed Afr/Ap 30 May 003/004 Estimated Afr/Ap 31 May 003/005 Predicted Afr/Ap 01 Jun-03 Jun 003/005-003/005-010/015
VI. Geomagnetic Activity Probabilities 01 Jun to 03 Jun
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 25% |
| Minor storm | 01% | 01% | 10% |
| Major-severe storm | 01% | 01% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 30% |
| Minor storm | 05% | 05% | 15% |
| Major-severe storm | 01% | 01% | 10% |
All times in UTC
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