Joint USAF/NOAA Report of Solar and Geophysical Activity 08 Sep 2008
Product: Report of Solar-Geophysical Activity
Issued: 2008 Sep 08 2200 UTC
Prepared jointly by the U.S. Dept. of Commerce, NOAA,
Space Weather Prediction Center and the U.S. Air Force.
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 252 Issued at 2200Z on 08 Sep 2008
IA. Analysis of Solar Active Regions and Activity from 07/2100Z to 08/2100Z: Solar activity was very low. No flares were observed. The visible disk remained spotless.
IB. Solar Activity Forecast: Solar activity is expected to be very low.
IIA. Geophysical Activity Summary 07/2100Z to 08/2100Z: Geomagnetic field activity was at quiet to unsettled levels. ACE solar wind data indicated Earth remained within a recurrent coronal hole high-speed stream. However, solar wind velocities gradually decreased from a high of 624 km/sec at 07/2131Z to a low of 534 km/sec at 08/2043Z. The greater than 2 MeV electron flux at geosynchronous orbit reached high levels during the period. IIB. Geophysical Activity Forecast: Geomagnetic field activity is expected to be at predominantly quiet levels through the forecast period (09 – 11 September).
III. Event Probabilities 09 Sep-11 Sep
- Class M 01/01/01
- Class X 01/01/01
- Proton 01/01/01
- PCAF green
IV. Penticton 10.7 cm Flux
- Observed 08 Sep 067
- Predicted 09 Sep-11 Sep 066/066/066
- 90 Day Mean 08 Sep 066
V. Geomagnetic A Indices
- Observed Afr/Ap 07 Sep 007/008
- Estimated Afr/Ap 08 Sep 007/005
- Predicted Afr/Ap 09 Sep-11 Sep 005/005-005/005-005/005
VI. Geomagnetic Activity Probabilities 09 Sep-11 Sep
A. Middle Latitudes
- Active 10/10/10
- Minor storm 01/01/01
- Major-severe storm 01/01/01
B. High Latitudes
- Active 15/15/15
- Minor storm 01/01/01
- Major-severe storm 01/01/01