Report of Solar-Geophysical Activity

Issued: 2007 Apr 26 0408 UTC

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

IA. Analysis of Solar Active Regions and Activity from 25/2100Z to 26/2100Z: Solar activity was very low. Region 953 (S10E61) produced only B-class activity during the past 24 hours.

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

IIA. Geophysical Activity Summary 25/2100Z to 26/2100Z:

The geomagnetic field has been quiet to unsettled.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be quiet to unsettled on 27 April. A recurrent coronal hole high speed stream is expected to become geoeffective on 28 April. Expect unsettled to minor storm conditions on 28 - 29 April.

III. Event Probabilities 27 Apr-29 Apr

Class M 05/05/05

Class X 01/01/01

Proton 01/01/01

PCAF Green

IV. Penticton 10.7 cm Flux

Observed 26 Apr 081

Predicted 27 Apr-29 Apr 080/080/080

90 Day Mean 26 Apr 074

V. Geomagnetic A Indices

Observed Afr/Ap 25 Apr 004/005

Estimated Afr/Ap 26 Apr 005/005

Predicted Afr/Ap 27 Apr-29 Apr 005/005-015/025-015/015 VI. Geomagnetic Activity Probabilities 27 Apr-29 Apr A. Middle Latitudes

Active 10/30/30

Minor storm 01/20/20

Major-severe storm 01/05/05

B. High Latitudes

Active 10/40/35

Minor storm 05/25/20

Major-severe storm 01/10/05

For current space weather conditions please refer to:

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