Viewing archive of Sunday, 17 February 2002
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 2002 Feb 17 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 048 Issued at 2200Z on 17 Feb 2002IA. Analysis of Solar Active Regions and Activity from 16-2100Z to 17-2100Z Solar activity remained at low levels. Region 9830
(S18E31) was the most active of the visible regions. It produced
occasional subflares as it grew at a gradual pace with increased
sunspot area and magnetic complexity. A magnetic delta configuration
may have developed within its leader spots. Region 9825 (N12W35)
continued to gradually decay and simplify. The remaining active
regions were unremarkable.
IB. Solar Activity Forecast
Solar activity is expected to be at
low to moderate levels. There is a chance for an isolated M-class
flare from Region 9830.
IIA. Geophysical Activity Summary 16-2100Z to 17-2100Z
Geomagnetic field activity was at quiet to active levels. Activity
increased to unsettled to active levels during 17/0300 - 0900 UTC
following a sudden impulse at 17/0257 UTC (13 nT, as measured by the
Boulder USGS magnetometer). Field activity decreased to quiet to
unsettled levels after 17/0900 UTC. This brief increase in activity
appeared to be the result of a weak CME passage.
IIB. Geophysical Activity Forecast
Geomagnetic field activity is
expected to be at quiet to unsettled levels.
III. Event Probabilities 18 Feb to 20 Feb
| Class M | 40% | 40% | 40% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 17 Feb 197 Predicted 18 Feb-20 Feb 195/195/190 90 Day Mean 17 Feb 222
V. Geomagnetic A Indices
Observed Afr/Ap 16 Feb 002/005 Estimated Afr/Ap 17 Feb 008/008 Predicted Afr/Ap 18 Feb-20 Feb 010/010-010/012-010/012
VI. Geomagnetic Activity Probabilities 18 Feb to 20 Feb
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 20% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 25% | 25% |
| Minor storm | 15% | 15% | 15% |
| Major-severe storm | 05% | 05% | 05% |
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