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

Product: Report of Solar-Geophysical Activity
Issued: 2007 Aug 26 0232 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 237 Issued at 2200Z on 25 Aug 2007

IA. Analysis of Solar Active Regions and Activity from 24/2100Z to 25/2100Z: Solar activity was very low.

IB. Solar Activity Forecast: Solar activity is expected to be very low to low. Region 969 (S05E22) could produce an isolated C-class event.

IIA. Geophysical Activity Summary 24/2100Z to 25/2100Z: The geomagnetic field was at quiet to unsettled levels.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be quiet to unsettled, with isolated periods of active conditions. The increase in activity levels is expected due to a favorably positioned coronal hole.

III. Event Probabilities 26 Aug-28 Aug

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

IV. Penticton 10.7 cm Flux

• Observed 25 Aug 072
• Predicted 26 Aug-28 Aug 070/070/070
• 90 Day Mean 25 Aug 072

V. Geomagnetic A Indices

• Observed Afr/Ap 24 Aug 001/002
• Estimated Afr/Ap 25 Aug 008/012
• Predicted Afr/Ap 26 Aug-28 Aug 010/015-008/012-008/008

VI. Geomagnetic Activity Probabilities 26 Aug-28 Aug

A. Middle Latitudes

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

B. High Latitudes

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