Viewing archive of Friday, 31 May 2002
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 2002 May 31 2200 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 2002IA. Analysis of Solar Active Regions and Activity from 30-2100Z to 31-2100Z Solar activity was at moderate levels. The largest
flare during the period was an M2 x-ray flare that occurred at
31/0016 UTC. The source region, based on EIT/LASCO imagery, is
believed to originate from an area just behind the east limb in the
proximity of newly numbered Region 9979 (S31E77). A long duration
C3 x-ray flare that occurred 31/0321 UTC had an associated Type II
radio sweep with an estimated shock velocity of 498 km/s. The
source region for this event appears to have originated from the
northwest limb, again, based on EIT/LASCO imagery. Region 9973
(S16E34) produced several minor C-class flares and retains a
moderately complex beta-gamma magnetic structure to the spot group.
Regions 9977 (S20W41) and 9978 (S20E62) were also numbered today.
IB. Solar Activity Forecast
Solar activity is expected to be at
moderate levels. Region 9973 has a slight chance of producing a
major flare event.
IIA. Geophysical Activity Summary 30-2100Z to 31-2100Z
The geomagnetic field was at quiet to unsettled levels.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be at quiet to unsettled levels through the forecast
period.
III. Event Probabilities 01 Jun to 03 Jun
| Class M | 50% | 50% | 50% |
| Class X | 05% | 05% | 05% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 31 May 182 Predicted 01 Jun-03 Jun 175/170/165 90 Day Mean 31 May 182
V. Geomagnetic A Indices
Observed Afr/Ap 30 May 005/009 Estimated Afr/Ap 31 May 005/006 Predicted Afr/Ap 01 Jun-03 Jun 005/008-005/008-006/008
VI. Geomagnetic Activity Probabilities 01 Jun to 03 Jun
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 20% |
| Minor storm | 05% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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