Joint USAF/NOAA Report of Solar and Geophysical Activity 01 Apr 2007

Product: Report of Solar-Geophysical Activity
Issued: 2007 Apr 01 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 091 Issued at 2200Z on 01 Apr 2007

IA. Analysis of Solar Active Regions and Activity from 31/2100Z to 01/2100Z: Solar activity has been very low.

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

IIA. Geophysical Activity Summary 31/2100Z to 01/2100Z: The geomagnetic field was active with periods of minor storming due to a recurrent coronal hole high speed stream.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be unsettled to active for April 2 & 3. Periods of minor storming remain possible. On April 4 the geomagnetic field is expected to return to quiet conditions as the recurrent coronal hole rotates out of its geoeffective position.

III. Event Probabilities 02 Apr-04 Apr

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

IV. Penticton 10.7 cm Flux

• Observed 01 Apr 072
• Predicted 02 Apr-04 Apr 072/072/072
• 90 Day Mean 01 Apr 078

V. Geomagnetic A Indices

• Observed Afr/Ap 31 Mar 002/003
• Estimated Afr/Ap 01 Apr 016/030
• Predicted Afr/Ap 02 Apr-04 Apr 014/020-012/015-005/005

VI. Geomagnetic Activity Probabilities 02 Apr-04 Apr

A. Middle Latitudes

• Active 35/35/15
• Minor storm 20/20/10
• Major-severe storm 05/05/01

B. High Latitudes

• Active 40/40/20
• Minor storm 25/25/15
• Major-severe storm 10/10/05