Joint USAF/NOAA Report of Solar and Geophysical Activity 07 May 2008

Product: Report of Solar-Geophysical Activity
Issued: 2008 May 07 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 128 Issued at 2200Z on 07 May 2008

IA. Analysis of Solar Active Regions and Activity from 06/2100Z to 07/2100Z: Solar activity was very low. No flares occurred and the visible disk remained spotless.

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

IIA. Geophysical Activity Summary 06/2100Z to 07/2100Z: The geomagnetic field was quiet. Solar wind velocities, as measured at the ACE satellite, decreased to below 500 km/s late in the period. 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 predominately quiet for the next three days (08-10 May).

III. Event Probabilities 08 May-10 May

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

IV. Penticton 10.7 cm Flux

• Observed 07 May 067
• Predicted 08 May-10 May 068/068/068
• 90 Day Mean 07 May 071

V. Geomagnetic A Indices

• Observed Afr/Ap 06 May 009/010
• Estimated Afr/Ap 07 May 005/008
• Predicted Afr/Ap 08 May-10 May 005/005-005/008-005/005

VI. Geomagnetic Activity Probabilities 08 May-10 May

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