Joint USAF/NOAA Report of Solar and Geophysical Activity 25 Apr 2008
Product: Report of Solar-Geophysical Activity
Issued: 2008 Apr 25 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 116 Issued at 2200Z on 25 Apr 2008
IA. Analysis of Solar Active Regions and Activity from 24/2100Z to 25/2100Z: Solar activity was very low. The disk was spotless. A nine degree filament, located at S10W18, disappeared between 24/1633Z and 25/0524Z.
IB. Solar Activity Forecast: Solar activity is expected to remain very low.
IIA. Geophysical Activity Summary 24/2100Z to 25/2100Z: The geomagnetic field was at quiet to unsettled levels. The greater than 2 MeV electron flux at geosynchronous orbit was at high levels again today.
IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at predominately quiet levels for the next three days (26 – 28 April).
III. Event Probabilities 26 Apr-28 Apr
- Class M 01/01/01
- Class X 01/01/01
- Proton 01/01/01
- PCAF Green
IV. Penticton 10.7 cm Flux
- Observed 25 Apr 070
- Predicted 26 Apr-28 Apr 070/070/070
- 90 Day Mean 25 Apr 072
V. Geomagnetic A Indices
- Observed Afr/Ap 24 Apr 013/018
- Estimated Afr/Ap 25 Apr 008/012
- Predicted Afr/Ap 26 Apr-28 Apr 005/008-005/005-005/005
VI. Geomagnetic Activity Probabilities 26 Apr-28 Apr
A. Middle Latitudes
- Active 10/10/10
- Minor storm 05/05/05
- Major-severe storm 01/01/01
B. High Latitudes
- Active 20/10/10
- Minor storm 05/05/05
- Major-severe storm 01/01/01