Viewing archive of Saturday, 19 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 19 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 139 Issued at 2200Z on 19 May 2001IA. Analysis of Solar Active Regions and Activity from 18-2100Z to 19-2100Z Solar activity was low. Only occasional C-class flares
occurred during the period. The largest event was an optically
uncorrelated C6 flare at 19/1438 UTC. This was accompanied by a Type
II radio sweep (470 km/s). Although imagery was non-conclusive, it
appears that this event originated in Region 9455 (S17W90+) which
was at or near the west limb at the time. A non-earth directed
coronal mass ejection from this event was detected by the LASCO/SOHO
spacecraft. Two new regions were numbered, 9463 (N07E70) and 9464
(S11E70).
IB. Solar Activity Forecast
Solar activity is expected to be low
with a slight chance of isolated M-class events.
IIA. Geophysical Activity Summary 18-2100Z to 19-2100Z
The geomagnetic field was quiet to active. The greater than 2 MeV
electron flux at geosynchronous orbit reached moderate levels during
the period.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled. The greater than 2 MeV electron
flux can be expected to reach moderate levels during the forecast
period.
III. Event Probabilities 20 May to 22 May
| Class M | 30% | 30% | 30% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 19 May 141 Predicted 20 May-22 May 135/130/130 90 Day Mean 19 May 168
V. Geomagnetic A Indices
Observed Afr/Ap 18 May 011/011 Estimated Afr/Ap 19 May 012/012 Predicted Afr/Ap 20 May-22 May 008/012-008/012-008/010
VI. Geomagnetic Activity Probabilities 20 May to 22 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 20% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 25% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
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