Viewing archive of Friday, 7 May 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 May 07 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 128 Issued at 2200Z on 07 May 2004IA. Analysis of Solar Active Regions and Activity from 06-2100Z to 07-2100Z Solar activity was low. Region 605 (S12W45) produced a
C1/Sf flare at 07/1403Z. A rather faint CME was visible on LASCO
imagery following this flare. Region 605 continues to gradually
decay and now exists as a simple alpha spot group. New Region 606
(S09E81) rotated into view on the east limb during this period. Limb
proximity makes it difficult to accurately assess true size and
complexity; however, a CME was observed to erupt from this location
at 07/1050Z. An associated Type II radio sweep (739 km/s) also
occurred. No other significant activity was noted.
IB. Solar Activity Forecast
Solar activity is expected to be low.
New Region 606 possesses the best potential for C-class activity.
IIA. Geophysical Activity Summary 06-2100Z to 07-2100Z
The geomagnetic field was quiet to active. The high speed coronal
hole stream that became geoeffective on 05 May continues to buffet
the geomagnetic field. Frequent southward IMF Bz oscillations over
the last 24 hours are responsible for the most disturbed periods.
The high speed stream does appear to be subsiding: solar wind speed
decreased to below 500 km/s late in the period. The greater than 2
MeV electron flux at geosynchronous orbit reached high levels today.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to active. Isolated active periods are possible
early on 08 May as the coronal hole high speed stream subsides. Weak
transient material from today's C1 flare and CME may produce
occasional unsettled to active periods on 10 May.
III. Event Probabilities 08 May to 10 May
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 07 May 085 Predicted 08 May-10 May 085/090/095 90 Day Mean 07 May 106
V. Geomagnetic A Indices
Observed Afr/Ap 06 May 010/008 Estimated Afr/Ap 07 May 015/018 Predicted Afr/Ap 08 May-10 May 008/008-005/008-010/015
VI. Geomagnetic Activity Probabilities 08 May to 10 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 25% |
| Minor storm | 05% | 05% | 10% |
| Major-severe storm | 01% | 01% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 30% |
| Minor storm | 10% | 05% | 15% |
| Major-severe storm | 05% | 01% | 05% |
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