Issued: 2007 Mar 29 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 088 Issued at 2200Z on 29 Mar 2007

IA. Analysis of Solar Active Regions and Activity from 28/2100Z to 29/2100Z: Solar activity was very low. Solar X-rays remained below B-level during the past 24 hours. Region 949 (N06E48) is a small C-type group and is the only spotted group on the disk.

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 during the past 24 hours.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be quiet for the next two days (30-31 March). An increase to unsettled levels with a chance for active periods is expected sometime late on the third day (1 April) due to a recurrent high speed stream from a favorably positioned coronal hole.

III. Event Probabilities 30 Mar-01 Apr

Class M 01/01/01

Class X 01/01/01

Proton 01/01/01

PCAF Green

IV. Penticton 10.7 cm Flux

Observed 29 Mar 074

Predicted 30 Mar-01 Apr 075/075/075

90 Day Mean 29 Mar 078

V. Geomagnetic A Indices

Observed Afr/Ap 28 Mar 006/007

Estimated Afr/Ap 29 Mar 005/005

Predicted Afr/Ap 30 Mar-01 Apr 005/005-005/005-007/010 VI. Geomagnetic Activity Probabilities 30 Mar-01 Apr A. Middle Latitudes

Active 15/15/20

Minor storm 05/05/05

Major-severe storm 01/01/01

B. High Latitudes

Active 15/15/20

Minor storm 05/05/10

Major-severe storm 01/01/05

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