Joint USAF/NOAA Report of Solar and Geophysical Activity 26 Dec 2007

Product: Report of Solar-Geophysical Activity
Issued: 2007 Dec 26 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 360 Issued at 2200Z on 26 Dec 2007

IA.  Analysis of Solar Active Regions and Activity from  25/2100Z to 26/2100Z:  Solar activity was very low.  The visible disk remains spotless.

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

IIA.  Geophysical Activity Summary 25/2100Z to 26/2100Z: 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, December 27 – 29.

III.  Event Probabilities 27 Dec-29 Dec

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

IV.  Penticton 10.7 cm Flux

• Observed           26 Dec 073
• Predicted   27 Dec-29 Dec  072/072/072
• 90 Day Mean        26 Dec 072

V.  Geomagnetic A Indices

• Observed Afr/Ap 25 Dec  002/002
• Estimated Afr/Ap 26 Dec  003/005
• Predicted Afr/Ap 27 Dec-29 Dec  003/005-003/005-003/005

VI.  Geomagnetic Activity Probabilities 27 Dec-29 Dec

A.  Middle Latitudes

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

B.  High Latitudes

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