:Product: 0421RSGA.txt
:Issued: 2008 Apr 21 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 112 Issued at 2200Z on 21 Apr 2008
IA.  Analysis of Solar Active Regions and Activity from  20/2100Z
to 21/2100Z:  Solar activity was very low. No flares occurred during
the past 24 hours. The solar disk is void of spots.
IB.  Solar Activity Forecast:  Solar activity is expected to be very
low.
IIA.  Geophysical Activity Summary 20/2100Z to 21/2100Z:
The geomagnetic field was mostly quiet during the past 24 hours.
IIB.  Geophysical Activity Forecast:  The geomagnetic field is
expected be quiet for most of the first day (22 April). However, an
increase to unsettled with a chance for isolated active periods is
expected late on the first day (22 April) or early on the second day
(23 April) with the onset of a high speed solar wind stream.
Unsettled levels with occasional active periods are expected to
persist for the second and third days (23-24 April).
III.  Event Probabilities 22 Apr-24 Apr
Class M    01/01/01
Class X    01/01/01
Proton     01/01/01
PCAF       Green
IV.  Penticton 10.7 cm Flux
Observed           21 Apr 071
Predicted   22 Apr-24 Apr  075/075/075
90 Day Mean        21 Apr 072
V.  Geomagnetic A Indices
Observed Afr/Ap 20 Apr  001/004
Estimated Afr/Ap 21 Apr  005/005
Predicted Afr/Ap 22 Apr-24 Apr  008/008-015/015-012/012
VI.  Geomagnetic Activity Probabilities 22 Apr-24 Apr
A.  Middle Latitudes
Active                25/40/35
Minor storm           10/15/15
Major-severe storm    05/05/05
B.  High Latitudes
Active                25/45/40
Minor storm           15/20/20
Major-severe storm    05/10/10