Viewing archive of Saturday, 12 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 12 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 132 Issued at 2200Z on 12 May 2001IA. Analysis of Solar Active Regions and Activity from 11-2100Z to 12-2100Z
Solar activity was low during the past 24 hours.
Several C-class events were observed. The largest of these was a
C5/Sf flare at 1210 UTC from Region 9454 (N13E46). Region 9454 is
currently the largest sunspot group on the disk and has some
magnetic complexity. Region 9455 (S16E03) grew steadily during the
past 24 hours and produced the majority of today's C-class events.
Newly assigned Region 9456 (N06W04) emerged on the disk during the
past 24 hours.
IB. Solar Activity Forecast
Solar activity is expected to be low
to moderate. There is a fair chance for an isolated M-class event
during the next three days from any of regions 9454, 9455, or 9456.
Of these, Region 9455 appears to be the best candidate for continued
flare activity.
IIA. Geophysical Activity Summary 11-2100Z to 12-2100Z
The geomagnetic field ranged from quiet to major storm levels during
the past 24 hours. Unsettled to active levels predominated most of
the day, but the period from 0900-1500Z saw minor storm levels at
mid-latitudes and major storm levels at high latitudes.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be unsettled to active for the next 24 hours.
Predominantly unsettled levels should prevail during the second and
third days.
III. Event Probabilities 13 May to 15 May
| Class M | 35% | 35% | 35% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 12 May 138 Predicted 13 May-15 May 140/142/144 90 Day Mean 12 May 167
V. Geomagnetic A Indices
Observed Afr/Ap 11 May 005/009 Estimated Afr/Ap 12 May 025/035 Predicted Afr/Ap 13 May-15 May 015/015-012/010-010/010
VI. Geomagnetic Activity Probabilities 13 May to 15 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 20% |
| Minor storm | 15% | 10% | 10% |
| Major-severe storm | 10% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 25% | 25% |
| Minor storm | 20% | 15% | 15% |
| Major-severe storm | 10% | 05% | 05% |
All times in UTC
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