Joint USAF/NOAA Report of Solar and Geophysical Activity 27 Nov 2007

Product: Report of Solar-Geophysical Activity
Issued: 2007 Nov 27 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 331 Issued at 2200Z on 27 Nov 2007

IA. Analysis of Solar Active Regions and Activity from 26/2100Z to 27/2100Z: Solar activity was very low. No flares occurred during the past 24 hours. Region 975 (N03W50) has decayed to spotless plage.

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

IIA. Geophysical Activity Summary 26/2100Z to 27/2100Z: The geomagnetic field was mostly quiet. Solar wind speed steadily declined throughout the period with day-end values around 440 km/s. The greater than 2 MeV electron flux at geosynchronous orbit reached high levels during the past 24 hours.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be quiet for the next three days (28-30 November).

III. Event Probabilities 28 Nov-30 Nov

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

IV. Penticton 10.7 cm Flux

• Observed 27 Nov 071
• Predicted 28 Nov-30 Nov 070/070/070
• 90 Day Mean 27 Nov 068

V. Geomagnetic A Indices

• Observed Afr/Ap 26 Nov 006/008
• Estimated Afr/Ap 27 Nov 005/005
• Predicted Afr/Ap 28 Nov-30 Nov 005/005-005/005-005/005

VI. Geomagnetic Activity Probabilities 28 Nov-30 Nov

A. Middle Latitudes

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

B. High Latitudes

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