Viewing archive of Thursday, 17 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 17 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 137 Issued at 2200Z on 17 May 2001IA. Analysis of Solar Active Regions and Activity from 16-2100Z to 17-2100Z Solar activity was moderate due to a single M-class
event, an M1/1f flare from Region 9455 (S16W66) at 17/1652. Regions
9451 (S20W90+), 9454 (N14W22), and 9455 all produced C-class events
during the period. Region 9455 produced a C9/1f at the end of the
reporting period. Region 9461 (N18E49), returning Region 9433
(responsible for major flares during its previous two rotations),
continued to show little activity and is currently a 4-spot D-type
group.
IB. Solar Activity Forecast
Solar activity is expected to be at
low to moderate levels. Regions 9454 and 9455 could produce isolated
M-class events during the forecast period.
IIA. Geophysical Activity Summary 16-2100Z to 17-2100Z
The geomagnetic field ranged from quiet to unsettled levels. The
greater than 2 MeV electron flux at geosynchronous orbit reached
high levels during the period.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be at quiet to unsettled levels with a possibility of
isolated active periods at high latitudes on 18 May. The greater
than 2 MeV electron flux may reach high levels during the period.
III. Event Probabilities 18 May to 20 May
| Class M | 40% | 40% | 40% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 17 May 147 Predicted 18 May-20 May 150/155/160 90 Day Mean 17 May 167
V. Geomagnetic A Indices
Observed Afr/Ap 16 May 007/012 Estimated Afr/Ap 17 May 010/012 Predicted Afr/Ap 18 May-20 May 012/020-010/012-008/010
VI. Geomagnetic Activity Probabilities 18 May to 20 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 20% | 20% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 25% | 25% |
| Minor storm | 15% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
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