Joint USAF/NOAA Report of Solar and Geophysical Activity 11 Apr 2008

Product: Report of Solar-Geophysical Activity
Issued: 2008 Apr 11 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 102 Issued at 2200Z on 11 Apr 2008

IA. Analysis of Solar Active Regions and Activity from 10/2100Z to 11/2100Z: Solar activity was very low.

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

IIA. Geophysical Activity Summary 10/2100Z to 11/2100Z: The geomagnetic field was quiet. The greater than 2 MeV electron flux at geosynchronous orbit reached high levels again today.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be quiet for the forecast period, 12 – 14 April.

III. Event Probabilities 12 Apr-14 Apr

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

IV. Penticton 10.7 cm Flux

• Observed 11 Apr 067
• Predicted 12 Apr-14 Apr 070/070/070
• 90 Day Mean 11 Apr 072

V. Geomagnetic A Indices

• Observed Afr/Ap 10 Apr x/008
• Estimated Afr/Ap 11 Apr 005/005
• Predicted Afr/Ap 12 Apr-14 Apr 005/005-005/005-005/005

VI. Geomagnetic Activity Probabilities 12 Apr-14 Apr

A. Middle Latitudes

• Active 15/15/15
• Minor storm 05/05/05
• Major-severe storm 01/01/01

B. High Latitudes

• Active 20/20/20
• Minor storm 10/10/10
• Major-severe storm 01/01/01