Joint USAF/NOAA Report of Solar and Geophysical Activity 04 Apr 2009

Product: Report of Solar-Geophysical Activity Issued: 2009 Apr 04 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 094 Issued at 2200Z on 04 Apr 2009

IA. Analysis of Solar Active Regions and Activity from 03/2100Z to 04/2100Z: Solar activity was very low. No flares occurred during the past 24 hours and the solar disk continues to be void of sunspots.

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

IIA. Geophysical Activity Summary 03/2100Z to 04/2100Z: The geomagnetic field was quiet during the past 24 hours.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be quiet for the next three days (5-7 April).

III. Event Probabilities 05 Apr-07 Apr

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

IV. Penticton 10.7 cm Flux

• Observed 04 Apr 070
• Predicted 05 Apr-07 Apr 070/070/070
• 90 Day Mean 04 Apr 070

V. Geomagnetic A Indices

• Observed Afr/Ap 03 Apr 002/002
• Estimated Afr/Ap 04 Apr 001/003
• Predicted Afr/Ap 05 Apr-07 Apr 005/005-005/005-005/005

VI. Geomagnetic Activity Probabilities 05 Apr-07 Apr

A. Middle Latitudes

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

B. High Latitudes

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