Viewing archive of Wednesday, 18 February 2004
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 2004 Feb 18 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 049 Issued at 2200Z on 18 Feb 2004IA. Analysis of Solar Active Regions and Activity from 17-2100Z to 18-2100Z Solar activity was at very low levels today. Spotless
active Region 556 (N15W80) produced the largest event during the
period, a B5 x-ray flare that occurred at 18/1708Z. Several lesser
B-class flares comprised the remainder of the recorded activity
today. No new regions were numbered today.
IB. Solar Activity Forecast
Solar activity is expected to be at
very low levels.
IIA. Geophysical Activity Summary 17-2100Z to 18-2100Z
The geomagnetic field was at quiet to unsettled levels. The greater
than 2 MeV electron fluxes at geosynchronous orbit reached high
(neared very high) levels today.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be at predominantly quiet to unsettled levels throughout
the period.
III. Event Probabilities 19 Feb to 21 Feb
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 18 Feb 098 Predicted 19 Feb-21 Feb 100/095/100 90 Day Mean 18 Feb 119
V. Geomagnetic A Indices
Observed Afr/Ap 17 Feb 004/005 Estimated Afr/Ap 18 Feb 004/008 Predicted Afr/Ap 19 Feb-21 Feb 008/008-008/008-008/012
VI. Geomagnetic Activity Probabilities 19 Feb to 21 Feb
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 25% |
| Minor storm | 05% | 05% | 10% |
| Major-severe storm | 01% | 01% | 05% |
All times in UTC
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