Issued: 2007 Apr 02 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 092 Issued at 2200Z on 02 Apr 2007

IA. Analysis of Solar Active Regions and Activity from 01/2100Z to 02/2100Z: Solar activity has been very low.

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

IIA. Geophysical Activity Summary 01/2100Z to 02/2100Z:

The geomagnetic field was active with periods of minor storming due to a recurrent coronal hole high speed stream. The greater than 2 MeV electron flux at geosynchronous orbit reached high levels today.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be unsettled to active on April 3 and quiet on April 4 & 5.

III. Event Probabilities 03 Apr-05 Apr

Class M 01/01/01

Class X 01/01/01

Proton 01/01/01

PCAF Green

IV. Penticton 10.7 cm Flux

Observed 02 Apr 071

Predicted 03 Apr-05 Apr 072/072/072

90 Day Mean 02 Apr 077

V. Geomagnetic A Indices

Observed Afr/Ap 01 Apr 017/030

Estimated Afr/Ap 02 Apr 014/020

Predicted Afr/Ap 03 Apr-05 Apr 012/012-005/008-005/005 VI. Geomagnetic Activity Probabilities 03 Apr-05 Apr A. Middle Latitudes

Active 30/15/15

Minor storm 20/10/10

Major-severe storm 05/01/01

B. High Latitudes

Active 40/40/20

Minor storm 25/25/15

Major-severe storm 10/05/05

http://www.sec.noaa.gov/SWN/

http://www.sec.noaa.gov/alerts/

NOAA Space Weather Scale descriptions can be found at www.sec.noaa.gov/NOAAscales