Joint USAF/NOAA Report of Solar and Geophysical Activity 30 May 2008

Product: Report of Solar-Geophysical Activity
Issued: 2008 May 30 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 151 Issued at 2200Z on 30 May 2008

IA. Analysis of Solar Active Regions and Activity from 29/2100Z to 30/2100Z: Solar activity was at very low levels. The visible disk remained spotless.

IB. Solar Activity Forecast: Solar activity is expected to remain at very low levels.

IIA. Geophysical Activity Summary 29/2100Z to 30/2100Z: The geomagnetic field was at quiet to unsettled levels. Solar wind velocities peaked at 665 km/s at about 30/0400Z, and remained elevated between 550 – 600 km/s for the balance of the period.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to unsettled levels, with a chance for isolated active periods, during days one and two (31 May – 01 Jun). By day three (02 Jun), the geomagnetic field is expected to return to mostly quiet levels.

III. Event Probabilities 31 May-02 Jun

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

IV. Penticton 10.7 cm Flux

• Observed 30 May 067
• Predicted 31 May-02 Jun 068/068/068
• 90 Day Mean 30 May 071

V. Geomagnetic A Indices

• Observed Afr/Ap 29 May 007/009
• Estimated Afr/Ap 30 May 008/008
• Predicted Afr/Ap 31 May-02 Jun 008/010-008/010-005/008

VI. Geomagnetic Activity Probabilities 31 May-02 Jun

A. Middle Latitudes

• Active 15/15/10
• Minor storm 05/05/01
• Major-severe storm 01/01/01

B. High Latitudes

• Active 30/30/25
• Minor storm 10/10/05
• Major-severe storm 05/05/05