Joint USAF/NOAA Report of Solar and Geophysical Activity 29 Jul 2008

Product: Report of Solar-Geophysical Activity
Issued: 2008 Jul 29 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 211 Issued at 2200Z on 29 Jul 2008

IA. Analysis of Solar Active Regions and Activity from 28/2100Z to 29/2100Z: Solar activity was very low. The visible disk is spotless. No flares occurred during the past 24 hours.

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

IIA. Geophysical Activity Summary 28/2100Z to 29/2100Z: The geomagnetic field was quiet. The solar wind speed at ACE declined from 440 km/s to 380 km/s.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be quiet on days one and two (30-31 July) and quiet to unsettled on day three (1 August) due to a solar sector boundary crossing.

III. Event Probabilities 30 Jul-01 Aug

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

IV. Penticton 10.7 cm Flux

• Observed 29 Jul 066
• Predicted 30 Jul-01 Aug 066/066/066
• 90 Day Mean 29 Jul 067

V. Geomagnetic A Indices

• Observed Afr/Ap 28 Jul 006/007
• Estimated Afr/Ap 29 Jul 005/005
• Predicted Afr/Ap 30 Jul-01 Aug 005/005-005/005-007/008

VI. Geomagnetic Activity Probabilities 30 Jul-01 Aug

A. Middle Latitudes

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

B. High Latitudes

• Active 15/15/25
• Minor storm 01/01/05
• Major-severe storm 01/01/01