Joint USAF/NOAA Report of Solar and Geophysical Activity 03 Apr 2007

Product: Report of Solar-Geophysical Activity
Issued: 2007 Apr 03 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 093 Issued at 2200Z on 03 Apr 2007

IA. Analysis of Solar Active Regions and Activity from 02/2100Z to 03/2100Z: Solar activity has been very low. Region 950 (S12W32) was designated today.

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

IIA. Geophysical Activity Summary 02/2100Z to 03/2100Z: The geomagnetic field was active with periods of minor storming due to a recurrent coronal hole high speed stream. 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 unsettled tomorrow (April 4) and quiet on April 5 & 6.

III. Event Probabilities 04 Apr-06 Apr

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

IV. Penticton 10.7 cm Flux

• Observed 03 Apr 071
• Predicted 04 Apr-06 Apr 072/072/072
• 90 Day Mean 03 Apr 077

V. Geomagnetic A Indices

• Observed Afr/Ap 02 Apr 016/024
• Estimated Afr/Ap 03 Apr 010/010
• Predicted Afr/Ap 04 Apr-06 Apr 008/008-005/005-005/005

VI. Geomagnetic Activity Probabilities 04 Apr-06 Apr

A. Middle Latitudes

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

B. High Latitudes

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