Joint USAF/NOAA Report of Solar and Geophysical Activity 28 Oct 2005

Prepared jointly by the U.S. Dept. of Commerce, NOAA,
Space Environment Center and the U.S. Air Force.
Updated 2005 Oct 28 2204 UTC

Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 301 Issued at 2200Z on 28 Oct 2005

IA. Analysis of Solar Active Regions and Activity from 27/2100Z to 28/2100Z: Solar activity was at very low levels. No sunspots were reported on the visible disk. No new regions were numbered today.

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

IIA. Geophysical Activity Summary 27/2100Z to 28/2100Z: The geomagnetic field was at quiet levels. Solar wind speed has steadily decreased throughout the day and is now at approximately 400 km/s.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be quiet to unsettled.

III. Event Probabilities 29 Oct-31 Oct

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

IV. Penticton 10.7 cm Flux

• Observed 28 Oct 073
• Predicted 29 Oct-31 Oct 075/075/075
• 90 Day Mean 28 Oct 087

V. Geomagnetic A Indices

• Observed Afr/Ap 27 Oct 005/006
• Estimated Afr/Ap 28 Oct 003/007
• Predicted Afr/Ap 29 Oct-31 Oct 008/010-005/005-003/005

VI. Geomagnetic Activity Probabilities 29 Oct-31 Oct

A. Middle Latitudes

• Active 25/20/15
• Minor storm 10/10/05
• Major-severe storm 01/01/01

B. High Latitudes

• Active 30/20/20
• Minor storm 15/15/15
• Major-severe storm 05/01/01