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