Viewing archive of Monday, 14 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 14 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 134 Issued at 2200Z on 14 May 2001IA. Analysis of Solar Active Regions and Activity from 13-2100Z to 14-2100Z Activity decreased to low levels. Region 9455 (S17W24)
remained the most active of the visible regions. It produced
isolated C-class subflares, the largest of which was a C5/Sf at
14/0324 UTC. No significant changes occurred within this region, but
mixed polarities persisted within its intermediate spots. Some
polarity mixing was also observed in the vicinity of the leading
spots of Region 9454 (N12E18), which was relatively inactive during
the period. The remaining spot groups were unremarkable, including
newly numbered Regions 9458 (S11W45), 9459 (N26W09), and 9460
(S24E60).
IB. Solar Activity Forecast
Solar activity is expected to be at
low to moderate levels with a fair chance for an isolated M-class
flare from Region 9455. There will also be a slight chance for an
isolated M-class flare from Region 9454.
IIA. Geophysical Activity Summary 13-2100Z to 14-2100Z
Geomagnetic field activity was at unsettled to active levels until
approximately 14/0900 UTC, then decreased to quiet to unsettled
levels for the rest of the period. The greater than 2 MeV electron
flux at geosynchronous orbit increased to high levels during the
latter half of the period.
IIB. Geophysical Activity Forecast
Geomagnetic field activity is
expected to be at quiet to unsettled levels during most of the
period with a chance for active levels at high latitudes. The
greater than 2 MeV electron flux is expected to reach high levels
during the first half of the period.
III. Event Probabilities 15 May to 17 May
| Class M | 30% | 30% | 30% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 14 May 138 Predicted 15 May-17 May 145/150/155 90 Day Mean 14 May 167
V. Geomagnetic A Indices
Observed Afr/Ap 13 May 017/023 Estimated Afr/Ap 14 May 013/015 Predicted Afr/Ap 15 May-17 May 012/015-012/020-007/015
VI. Geomagnetic Activity Probabilities 15 May to 17 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 20% |
| Minor storm | 10% | 10% | 05% |
| Major-severe storm | 05% | 01% | 01% |
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