Viewing archive of Sunday, 27 May 2001
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 2001 May 27 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 147 Issued at 2200Z on 27 May 2001IA. Analysis of Solar Active Regions and Activity from 26-2100Z to 27-2100Z Solar activity was very low. All disk regions have been
relatively inactive. Region 9463 (N08W51), the largest sunspot group
presently on the disk, and Region 9468 (N06W16) have decayed since
yesterday. New Regions 9476 (S22W68), 9477 (S16E20), and 9478
(N14E15) were numbered.
IB. Solar Activity Forecast
Solar activity is expected to be low.
IIA. Geophysical Activity Summary 26-2100Z to 27-2100Z
The geomagnetic field ranged from quiet to active levels. An SI was
observed at the Boulder ground magnetometer at 27/1456 UTC following
a shock observed in the solar wind at ACE at 27/1418 UTC. Timing of
the structure seems consistent with the M1/1N/Type II event which
occurred on 24 May.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled with an occasional active period
during the passage of the CME. Quiet to unsettled conditions are
expected for the remainder of the forecast period.
III. Event Probabilities 28 May to 30 May
| Class M | 20% | 20% | 20% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 27 May 147 Predicted 28 May-30 May 140/140/135 90 Day Mean 27 May 169
V. Geomagnetic A Indices
Observed Afr/Ap 26 May 006/008 Estimated Afr/Ap 27 May 012/015 Predicted Afr/Ap 28 May-30 May 010/012-008/010-008/008
VI. Geomagnetic Activity Probabilities 28 May to 30 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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