Viewing archive of Monday, 18 October 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 Oct 18 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 292 Issued at 2200Z on 18 Oct 2004IA. Analysis of Solar Active Regions and Activity from 17-2100Z to 18-2100Z Solar activity was very low. Minor B-class activity was
observed during the latter half of the period. A CME erupted from
the northeast limb at approximately 17/2030Z. SXI imagery indicates
a new active region rotating near N07 on the east limb. Region 682
(S13W03) has shown slight decay in both area coverage and magnetic
complexity. Region 683 (S10E08) is a D type group in very slow
growth. New regions 685 (S05E26) and 686 (S20E43) were numbered
today.
IB. Solar Activity Forecast
Solar activity is expected to be very
low to low. Isolated C-class flares are possible from Regions 682
and 683. A new region rotating near N07 on the east limb may
increase solar activity levels in the coming days.
IIA. Geophysical Activity Summary 17-2100Z to 18-2100Z
The geomagnetic field was mostly quiet with isolated unsettled levels
late in the period. Solar wind speed remains below 350 km/s. The
greater than 2 MeV electron flux at geosynchronous orbit was high,
and have been high since 14 October.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled. Isolated active periods are
possible on 19 and 20 October.
III. Event Probabilities 19 Oct to 21 Oct
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 18 Oct 096 Predicted 19 Oct-21 Oct 100/105/110 90 Day Mean 18 Oct 106
V. Geomagnetic A Indices
Observed Afr/Ap 17 Oct 000/003 Estimated Afr/Ap 18 Oct 003/005 Predicted Afr/Ap 19 Oct-21 Oct 010/010-010/010-005/005
VI. Geomagnetic Activity Probabilities 19 Oct to 21 Oct
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 20% |
| Minor storm | 10% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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