:Product: 0420RSGA.txt
:Issued: 2010 Apr 20 2201 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 110 Issued at 2200Z on 20 Apr 2010
IA.  Analysis of Solar Active Regions and Activity from  19/2100Z
to 20/2100Z:  Solar activity was very low.  No flares were observed
during the last 24 hours and the disk remained spotless.
IB.  Solar Activity Forecast:  Solar activity is expected to remain
very low for the next three days (21-23 April).
IIA.  Geophysical Activity Summary 19/2100Z to 20/2100Z:
The geomagnetic field was quiet during the last 24 hours.
IIB.  Geophysical Activity Forecast:  The geomagnetic field is
expected to be quiet to unsettled with a slight chance for isolated
active periods for the next three days (21-23 April).  The increase
in activity is associated with several CMEs (observed on 15, 18 and
19 April) and a coronal hole high speed stream rotating into a
geoeffective position.
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 076
Predicted   21 Apr-23 Apr  080/082/084
90 Day Mean        20 Apr 082
V.  Geomagnetic A Indices
Observed Afr/Ap 19 Apr  003/005
Estimated Afr/Ap 20 Apr  003/005
Predicted Afr/Ap 21 Apr-23 Apr  010/012-012/015-010/012
VI.  Geomagnetic Activity Probabilities 21 Apr-23 Apr
A.  Middle Latitudes
Active                20/25/20
Minor storm           05/10/05
Major-severe storm    01/01/01
B.  High Latitudes
Active                25/30/25
Minor storm           10/15/10
Major-severe storm    05/05/05