Joint USAF/NOAA Report of Solar and Geophysical Activity 28 May 2007

Product: Report of Solar-Geophysical Activity
Issued: 2007 May 28 2200 UTC
Prepared jointly by the U.S. Dept. of Commerce, NOAA,
Space Environment Center and the U.S. Air Force.

Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 148 Issued at 2200Z on 28 May 2007

IA. Analysis of Solar Active Regions and Activity from 27/2100Z to 28/2100Z: Solar activity has been very low.

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

IIA. Geophysical Activity Summary 27/2100Z to 28/2100Z: The geomagnetic field has been predominately 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 May 29 – 31.

III. Event Probabilities 29 May-31 May

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

IV. Penticton 10.7 cm Flux

• Observed 28 May 069
• Predicted 29 May-31 May 065/065/065
• 90 Day Mean 28 May 073

V. Geomagnetic A Indices

• Observed Afr/Ap 27 May 010/012
• Estimated Afr/Ap 28 May 004/005
• Predicted Afr/Ap 29 May-31 May 003/005-003/005-002/005

VI. Geomagnetic Activity Probabilities 29 May-31 May

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