Joint USAF/NOAA Report of Solar and Geophysical Activity 19 Apr 2008
Product: Report of Solar-Geophysical Activity
Issued: 2008 Apr 19 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 110 Issued at 2200Z on 19 Apr 2008
IA. Analysis of Solar Active Regions and Activity from 18/2100Z to 19/2100Z: Solar activity was very low. New Region 991 (S09E29) was numbered today and has a Bxo-beta configuration spot group.
IB. Solar Activity Forecast: Solar activity is expected to remain very low. There is a slight chance of an isolated C-class event from Region 991.
IIA. Geophysical Activity Summary 18/2100Z to 19/2100Z: The geomagnetic field was quiet.
IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be mostly quiet on day one (20 April). A recurrent coronal hole high speed stream begins to become geoeffective on day two (21 April) with unsettled conditions expected. Unsettled to active levels, with a chance for minor to major storms at high latitudes, are anticipated by day three (22 April).
III. Event Probabilities 20 Apr-22 Apr
- Class M 01/01/01
- Class X 01/01/01
- Proton 01/01/01
- PCAF Green
IV. Penticton 10.7 cm Flux
- Observed 19 Apr 071
- Predicted 20 Apr-22 Apr 075/075/080
- 90 Day Mean 19 Apr 072
V. Geomagnetic A Indices
- Observed Afr/Ap 18 Apr 005/006
- Estimated Afr/Ap 19 Apr 005/005
- Predicted Afr/Ap 20 Apr-22 Apr 005/005-008/012-015/025
VI. Geomagnetic Activity Probabilities 20 Apr-22 Apr
A. Middle Latitudes
- Active 10/20/25
- Minor storm 05/05/10
- Major-severe storm 01/01/05
B. High Latitudes
- Active 10/10/40
- Minor storm 05/10/10
- Major-severe storm 01/05/10
