Joint USAF/NOAA Report of Solar and Geophysical Activity 07 Apr 2009

Product: Report of Solar-Geophysical Activity
Issued: 2009 Apr 08 1223 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 097 Issued at 2200Z on 07 Apr 2009

IA. Analysis of Solar Active Regions and Activity from 06/2100Z to 07/2100Z: Solar activity was very low. No flares were observed during the past 24 hours. The solar disk remains spotless.

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

IIA. Geophysical Activity Summary 06/2100Z to 07/2100Z: The geomagnetic field was quiet.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be quiet to unsettled for the next three days (08-10 April) due to a recurrent coronal high speed stream. Isolated active conditions at mid latitudes and minor storming at high latitudes are possible on 09 April.

III. Event Probabilities 08 Apr-10 Apr

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

IV. Penticton 10.7 cm Flux

• Observed 07 Apr 070
• Predicted 08 Apr-10 Apr 070/070/070
• 90 Day Mean 07 Apr 070

V. Geomagnetic A Indices

• Observed Afr/Ap 06 Apr 002/003
• Estimated Afr/Ap 07 Apr 002/005
• Predicted Afr/Ap 08 Apr-10 Apr 007/008-010/015-007/008

VI. Geomagnetic Activity Probabilities 08 Apr-10 Apr

A. Middle Latitudes

• Active 30/35/30
• Minor storm 05/10/05
• Major-severe storm 01/01/01

B. High Latitudes

• Active 35/35/35
• Minor storm 10/15/10
• Major-severe storm 05/05/05