Joint USAF/NOAA Report of Solar and Geophysical Activity 17 Apr 2008

Product: Report of Solar-Geophysical Activity
Issued: 2008 Apr 17 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 108 Issued at 2200Z on 17 Apr 2008

IA. Analysis of Solar Active Regions and Activity from 16/2100Z to 17/2100Z: Solar activity was very low. No flares occurred during the past 24 hours. Region 990 (N27W21) continues to be an area of spotless plage.

IB. Solar Activity Forecast: Solar activity is expected to be very low.

IIA. Geophysical Activity Summary 16/2100Z to 17/2100Z: The geomagnetic field was quiet to unsettled.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be mostly quiet.

III. Event Probabilities 18 Apr-20 Apr

• Class M 01/01/01
• Class X 01/01/01
• Proton 01/01/01
• PCAF Green

IV. Penticton 10.7 cm Flux

• Observed 17 Apr 069
• Predicted 18 Apr-20 Apr 070/070/075
• 90 Day Mean 17 Apr 072

V. Geomagnetic A Indices

• Observed Afr/Ap 16 Apr 009/015
• Estimated Afr/Ap 17 Apr 007/010
• Predicted Afr/Ap 18 Apr-20 Apr 005/005-005/005-005/005

VI. Geomagnetic Activity Probabilities 18 Apr-20 Apr

A. Middle Latitudes

• Active 10/10/10
• Minor storm 05/05/05
• Major-severe storm 01/01/01

B. High Latitudes

• Active 10/10/10
• Minor storm 05/05/05
• Major-severe storm 01/01/01