Joint USAF/NOAA Report of Solar and Geophysical Activity 20 Sep 2008
Product: Report of Solar-Geophysical Activity
Issued: 2008 Sep 20 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 264 Issued at 2200Z on 20 Sep 2008
IA. Analysis of Solar Active Regions and Activity from 19/2100Z to 20/2100Z: Solar activity was very low. No flares were observed during the past 24 hours. The visible solar disk remains spotless.
IB. Solar Activity Forecast: Solar activity is expected to be very low.
IIA. Geophysical Activity Summary 19/2100Z to 20/2100Z: The geomagnetic field was quiet.
IIB. Geophysical Activity Forecast: The geomagnetic field is expected to remain at quiet levels for the forecast period (21-23 September).
III. Event Probabilities 21 Sep-23 Sep
- Class M 01/01/01
- Class X 01/01/01
- Proton 01/01/01
- PCAF Green
IV. Penticton 10.7 cm Flux
- Observed 20 Sep 068
- Predicted 21 Sep-23 Sep 067/067/067
- 90 Day Mean 20 Sep 066
V. Geomagnetic A Indices
- Observed Afr/Ap 19 Sep 003/005
- Estimated Afr/Ap 20 Sep 003/005
- Predicted Afr/Ap 21 Sep-23 Sep 005/005-005/005-005/005
VI. Geomagnetic Activity Probabilities 21 Sep-23 Sep
A. Middle Latitudes
- Active 10/10/10
- Minor storm 01/01/01
- Major-severe storm 01/01/01
B. High Latitudes
- Active 10/10/10
- Minor storm 01/01/01
- Major-severe storm 01/01/01