Viewing archive of Sunday, 26 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 26 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 146 Issued at 2200Z on 26 May 2002IA. Analysis of Solar Active Regions and Activity from 25-2100Z to 26-2100Z
Solar activity remained at low levels. Region 9961
(S21W17) produced a C4/Sf flare at 26/1356 UTC, which was the
largest flare of the period. It appeared to simplify and may have
lost the delta in its intermediate spots. Region 9963 (N14W03)
showed minor spot growth, but remained simply-structured. It
produced a C-class subflare early in the period. Region 9957
(N10W58) was quiet as it continued to gradually decay and simplify.
However, a weak delta magnetic configuration persisted within its
northern spots. Region 9960 (N15W30) was quiet as it slowly decayed
and simplified. New Region 9970 (N05E54) emerged just to the south
of Region 9969 (N09E55). It appeared to be in a growth phase as it
produced occasional subflares.
IB. Solar Activity Forecast
Solar activity is expected to be at
low to moderate levels. There is a fair chance for an isolated,
low-level M-class flare. There is a slight chance for major flare
activity during the period.
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
Geomagnetic field activity was at quiet to unsettled levels.
IIB. Geophysical Activity Forecast
Geomagnetic field activity is
expected to be at mostly quiet levels through the period. There is a
slight chance for a proton event during the period.
III. Event Probabilities 27 May to 29 May
| Class M | 40% | 40% | 35% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | yellow | ||
IV. Penticton 10.7 cm Flux
Observed 26 May 183 Predicted 27 May-29 May 180/180/175 90 Day Mean 26 May 183
V. Geomagnetic A Indices
Observed Afr/Ap 25 May 003/006 Estimated Afr/Ap 26 May 005/008 Predicted Afr/Ap 27 May-29 May 007/008-005/008-005/008
VI. Geomagnetic Activity Probabilities 27 May to 29 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 15% |
| Minor storm | 05% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 20% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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