Joint USAF/NOAA Report of Solar and Geophysical Activity 31 Mar 2008

Product: Report of Solar-Geophysical Activity
Issued: 2008 Mar 31 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 091 Issued at 2200Z on 31 Mar 2008

IA. Analysis of Solar Active Regions and Activity from 30/2100Z to 31/2100Z: Solar activity was very low. Region 988 (S07W35) produced today’s only B-class flare, a B2/Sf at 0534Z. All three regions on the disk were quiet and stable and show an overall declining trend.

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

IIA. Geophysical Activity Summary 30/2100Z to 31/2100Z: The geomagnetic field was quiet. The greater than 2 MeV electron flux at geosynchronous orbit was high during the past 24 hours.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be quiet for the next three days (01-03 April).

III. Event Probabilities 01 Apr-03 Apr

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

IV. Penticton 10.7 cm Flux

• Observed 31 Mar 079
• Predicted 01 Apr-03 Apr 079/075/075
• 90 Day Mean 31 Mar 073

V. Geomagnetic A Indices

• Observed Afr/Ap 30 Mar 006/008
• Estimated Afr/Ap 31 Mar 005/005
• Predicted Afr/Ap 01 Apr-03 Apr 005/005-005/005-005/008

VI. Geomagnetic Activity Probabilities 01 Apr-03 Apr

A. Middle Latitudes

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

B. High Latitudes

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