Joint USAF/NOAA Report of Solar and Geophysical Activity 30 Aug 2004
Prepared jointly by the U.S. Dept. of Commerce, NOAA,
Space Environment Center and the U.S. Air Force.
Updated 2004 Aug 30 2210 UTC
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 243 Issued at 2200Z on 30 Aug 2004
IA. Analysis of Solar Active Regions and Activity from 29/2100Z
to 30/2100Z: Solar activity has been low. Region 663 (N04W73)
produced a C2.4 at 30/0311 UTC and a C1.0 flare at 1818 UTC. A Type
II radio sweep was observed with the C2.4 flare at 0325 UTC. Region
663 has grown slightly as it approaches the west limb and was
observed at 140 millionths in white light. No new regions were
numbered today.
IB. Solar Activity Forecast: Solar activity is expected to be very
low to low. Region 663 may produce C-class flares.
IIA. Geophysical Activity Summary 29/2100Z to 30/2100Z:
Geophysical activity has been at quiet to active levels. A minor
shock was observed at approximately 29/1900 UTC, most likely from a
CME associated with an erupting prominence observed on 27 Aug. Bz
at ACE remained below -10 nT for most of the day.
IIB. Geophysical Activity Forecast: Geomagnetic activity is
expected to be quiet to unsettled for the next three days. Active
conditions are possible early on day one (31 Aug) due to residual
effects from the CME shock observed 30 Aug.
III. Event Probabilities 31 Aug-02 Sep
- Class M 05/05/05
- Class X 01/01/01
- Proton 01/01/01
- PCAF green
IV. Penticton 10.7 cm Flux
- Observed 30 Aug 090
- Predicted 31 Aug-02 Sep 090/100/110
- 90 Day Mean 30 Aug 109
V. Geomagnetic A Indices
- Observed Afr/Ap 29 Aug 005/008
- Estimated Afr/Ap 30 Aug 020/025
- Predicted Afr/Ap 31 Aug-02 Sep 010/012-005/008-005/008
VI. Geomagnetic Activity Probabilities 31 Aug-02 Sep
A. Middle Latitudes
- Active 25/20/20
- Minor storm 15/10/10
- Major-severe storm 01/01/01
B. High Latitudes
- Active 30/25/25
- Minor storm 20/15/15
- Major-severe storm 01/01/01
