Viewing archive of Friday, 18 April 2003
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 2003 Apr 18 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 108 Issued at 2200Z on 18 Apr 2003IA. Analysis of Solar Active Regions and Activity from 17-2100Z to 18-2100Z Solar activity has been at moderate levels. There were
several minor C-class events during the last 24 hours with a single
M1.1 from Region 337 (S12E74) at 1958 UTC. A 13 degree disappearing
solar filament was observed early in the period near Region 335
(S25E21). There was a small coronal mass ejection associated with
that filament, but it was not earth-directed.
IB. Solar Activity Forecast
Solar activity is expected to be at
low to moderate levels for the entire period. Region 337 (S12E74)
is just coming on to the visible disk, and appears in solar x-ray
imagery to be a potentially active region.
IIA. Geophysical Activity Summary 17-2100Z to 18-2100Z
The geomagnetic field was at unsettled to active levels with an
isolated quiet period from 0300 UTC to 0600 UTC. The coronal hole
induced high speed solar wind stream continues. The greater than 2
MeV electron fluxes at geo-synchronous orbit reached high levels
today.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be at mostly unsettled levels as the current disturbance
continues to transition out of geoeffective range. Continued
unsettled levels are expected through day two, with a further
decrease to mostly quiet levels on day three.
III. Event Probabilities 19 Apr to 21 Apr
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 18 Apr 108 Predicted 19 Apr-21 Apr 110/110/115 90 Day Mean 18 Apr 127
V. Geomagnetic A Indices
Observed Afr/Ap 17 Apr 020/030 Estimated Afr/Ap 18 Apr 018/019 Predicted Afr/Ap 19 Apr-21 Apr 012/015-010/012-007/010
VI. Geomagnetic Activity Probabilities 19 Apr to 21 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 30% | 30% |
| Minor storm | 25% | 15% | 15% |
| Major-severe storm | 05% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 30% | 30% |
| Minor storm | 30% | 25% | 20% |
| Major-severe storm | 20% | 10% | 10% |
All times in UTC
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