Joint USAF/NOAA Report of Solar and Geophysical Activity 26 Apr 2006

Product: Report of Solar-Geophysical Activity
Issued: 2006 Apr 26 2200 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 116 Issued at 2200Z on 26 Apr 2006

IA. Analysis of Solar Active Regions and Activity from 25/2100Z to 26/2100Z: Solar activity reached moderate levels. Region 875 (S10E34) produced an M1/1f flare at 26/1702 UTC. This Region also produced a C9/sf flare at 26/1453 UTC. New Region 877 (S07E52) was numbered today.

IB. Solar Activity Forecast: Solar activity is expected to be low to moderate. Further M-class activity is possible from Region 875.

IIA. Geophysical Activity Summary 25/2100Z to 26/2100Z: The geomagnetic field was quiet.

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

III. Event Probabilities 27 Apr-29 Apr

• Class M 20/25/25
• Class X 05/05/05
• Proton 01/01/01
• PCAF green

IV. Penticton 10.7 cm Flux

• Observed 26 Apr 100
• Predicted 27 Apr-29 Apr 100/100/100
• 90 Day Mean 26 Apr 080

V. Geomagnetic A Indices

• Observed Afr/Ap 25 Apr 001/005
• Estimated Afr/Ap 26 Apr 003/005
• Predicted Afr/Ap 27 Apr-29 Apr 003/005-003/005-003/005

VI. Geomagnetic Activity Probabilities 27 Apr-29 Apr A. Middle Latitudes

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

B. High Latitudes

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