Joint USAF/NOAA Report of Solar and Geophysical Activity 18 Apr 2008
Product: Report of Solar-Geophysical Activity
Issued: 2008 Apr 18 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 109 Issued at 2200Z on 18 Apr 2008
IA. Analysis of Solar Active Regions and Activity from 17/2100Z to 18/2100Z: Solar activity was very low.
IB. Solar Activity Forecast: Solar activity is expected to remain very low.
IIA. Geophysical Activity Summary 17/2100Z to 18/2100Z: The geomagnetic field was quiet to unsettled.
IIB. Geophysical Activity Forecast: The geomagnetic field is expected to remain mostly quiet for days 1 and 2 (19-20 April) becming mostly unsettled by day 3 (21 April) as a recurrent coronal hole begins to rotate into a geoeffective position.
III. Event Probabilities 19 Apr-21 Apr
- Class M 01/01/01
- Class X 01/01/01
- Proton 01/01/01
- PCAF Green
IV. Penticton 10.7 cm Flux
- Observed 18 Apr 070
- Predicted 19 Apr-21 Apr 070/075/075
- 90 Day Mean 18 Apr 071
V. Geomagnetic A Indices
- Observed Afr/Ap 17 Apr 007/008
- Estimated Afr/Ap 18 Apr 007/007
- Predicted Afr/Ap 19 Apr-21 Apr 005/005-005/005-008/015
VI. Geomagnetic Activity Probabilities 19 Apr-21 Apr
A. Middle Latitudes
- Active 10/10/20
- Minor storm 05/05/05
- Major-severe storm 01/01/01
B. High Latitudes
- Active 10/10/40
- Minor storm 05/05/10
- Major-severe storm 01/01/05