Joint USAF/NOAA Report of Solar and Geophysical Activity 29 Dec 2007

Product: Report of Solar-Geophysical Activity
Issued: 2007 Dec 29 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 363 Issued at 2200Z on 29 Dec 2007

IA. Analysis of Solar Active Regions and Activity from 28/2100Z to 29/2100Z: Solar activity was very low. The visible disk remained spotless.

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

IIA. Geophysical Activity Summary 28/2100Z to 29/2100Z: The geomagnetic field was quiet. The greater than 2 MeV electrons at geosynchronous orbit reached high levels today. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to remain quiet.

III. Event Probabilities 30 Dec-01 Jan

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

IV. Penticton 10.7 cm Flux

• Observed 29 Dec 073
• Predicted 30 Dec-01 Jan 072/073/075
• 90 Day Mean 29 Dec 072

V. Geomagnetic A Indices

• Observed Afr/Ap 28 Dec 002/002
• Estimated Afr/Ap 29 Dec 005/005
• Predicted Afr/Ap 30 Dec-01 Jan 005/005-005/005-005/005

VI. Geomagnetic Activity Probabilities 30 Dec-01 Jan

A. Middle Latitudes

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

B. High Latitudes

• Active 15/15/10
• Minor storm 05/05/05
• Major-severe storm 12/02/01