:Product: 0521RSGA.txt
:Issued: 2008 May 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 142 Issued at 2200Z on 21 May 2008
IA.  Analysis of Solar Active Regions and Activity from  20/2100Z
to 21/2100Z:  Solar activity was very low. The visible disk is
spotless.
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 unsettled. An isolated active period
was observed at 21/0300 - 0600Z. Solar wind speed increased
gradually from approximately  450 km/s to values ranging between 550
- 620 km/s. The solar wind signatures were consistent with a high
speed stream from a coronal hole.
IIB.  Geophysical Activity Forecast:  The geomagnetic field is
expected to be unsettled with a chance for isolated active periods
for the next three days (22 - 24 May) due to persistent effects from
the high speed stream.
III.  Event Probabilities 22 May-24 May
Class M    01/01/01
Class X    01/01/01
Proton     01/01/01
PCAF       Green
IV.  Penticton 10.7 cm Flux
Observed           21 May 069
Predicted   22 May-24 May  068/068/068
90 Day Mean        21 May 071
V.  Geomagnetic A Indices
Observed Afr/Ap 20 May  007/010
Estimated Afr/Ap 21 May  015/015
Predicted Afr/Ap 22 May-24 May  008/015-008/010-008/010
VI.  Geomagnetic Activity Probabilities 22 May-24 May
A.  Middle Latitudes
Active                25/25/25
Minor storm           10/10/10
Major-severe storm    01/01/01
B.  High Latitudes
Active                40/40/40
Minor storm           20/20/20
Major-severe storm    10/10/10