:Product: 0420RSGA.txt
:Issued: 2008 Apr 20 2203 UTC
# Prepared jointly by the U.S. Dept. of Commerce, NOAA,
# Space Weather Prediction Center and the U.S. Air Force.
#
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 111 Issued at 2200Z on 20 Apr 2008
IA.  Analysis of Solar Active Regions and Activity from  19/2100Z
to 20/2100Z:  Solar activity was very low.  Region 991 (S10E15)
decayed to a spotless plage.
IB.  Solar Activity Forecast:  Solar activity is expected to remain
very low.
IIA.  Geophysical Activity Summary 19/2100Z to 20/2100Z:
The geomagnetic field was quiet to unsettled.
IIB.  Geophysical Activity Forecast:  The geomagnetic field is
expected to begin mostly quiet, increasing to  unsettled to active
on the second and third days of the forecast period as a recurrent
coronal hole high speed stream becomes geoeffective.  There is a
chance geomagnetic field activity will reach minor storm levels at
high latitudes.
III.  Event Probabilities 21 Apr-23 Apr
Class M    01/01/01
Class X    01/01/01
Proton     01/01/01
PCAF       Green
IV.  Penticton 10.7 cm Flux
Observed           20 Apr 071
Predicted   21 Apr-23 Apr  075/080/080
90 Day Mean        20 Apr 072
V.  Geomagnetic A Indices
Observed Afr/Ap 19 Apr  006/005
Estimated Afr/Ap 20 Apr  005/005
Predicted Afr/Ap 21 Apr-23 Apr  005/005-008/008-015/015
VI.  Geomagnetic Activity Probabilities 21 Apr-23 Apr
A.  Middle Latitudes
Active                10/20/25
Minor storm           05/10/15
Major-severe storm    01/05/10
B.  High Latitudes
Active                10/25/30
Minor storm           05/10/15
Major-severe storm    01/05/10