Report of Solar-Geophysical Activity

Issued: 2006 May 31 2200 UTC

Prepared jointly by the U.S. Dept. of Commerce, NOAA, # Space Environment Center and the U.S. Air Force.

Joint USAF/NOAA Report of Solar and Geophysical Activity SDF Number 151 Issued at 2200Z on 31 May 2006 IA. Analysis of Solar Active Regions and Activity from 30/2100Z to 31/2100Z: Solar activity was very low. No new regions were numbered today.

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 to unsettled.

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

June) with possible minor storm periods due to a recurrent coronal hole moving into geoeffective position.

III. Event Probabilities 01 Jun-03 Jun

Class M 01/01/01

Class X 01/01/01

Proton 01/01/01

PCAF green

IV. Penticton 10.7 cm Flux

Observed 31 May 078

Predicted 01 Jun-03 Jun 080/075/080

90 Day Mean 31 May 081

V. Geomagnetic A Indices

Observed Afr/Ap 30 May 007/009

Estimated Afr/Ap 31 May 006/012

Predicted Afr/Ap 01 Jun-03 Jun 010/015-015/020-015/020 VI. Geomagnetic Activity Probabilities 01 Jun-03 Jun A. Middle Latitudes

Active 20/25/25

Minor storm 10/15/15

Major-severe storm 01/05/05

B. High Latitudes

Active 25/30/30

Minor storm 15/20/20

Major-severe storm 05/10/10