:Product: 0528RSGA.txt
:Issued: 2008 May 28 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 149 Issued at 2200Z on 28 May 2008
IA.  Analysis of Solar Active Regions and Activity from  27/2100Z
to 28/2100Z:  Solar activity was at very low levels.  The visible
disk remained spotless.
IB.  Solar Activity Forecast:  Solar activity is expected to remain
at very low levels.
IIA.  Geophysical Activity Summary 27/2100Z to 28/2100Z:
The geomagnetic field was at mostly unsettled levels today.  At about
27/2200Z, the ACE satellite detected a Solar Sector Boundary
crossing from a negative (toward) orientation to a positive (away)
orientation.  At about 28/0130Z, a shock was detected at ACE with
subsequent sharp increases in both density and wind speed,
indicative of a co-rotating interaction region (CIR).  The CIR was
followed by the onset of a high speed stream at about 28/0500Z;
solar wind velocities increased to about 525 km/s by the end of the
summary period.  The greater than 2 MeV electron flux at
geosynchronous orbit reached high levels for a brief period today.
IIB.  Geophysical Activity Forecast:  The geomagnetic field is
expected to be at quiet to unsettled levels, with a chance for
isolated active periods, during all three days of the forecast
period (29 May to 31 May) due to the high speed stream.
III.  Event Probabilities 29 May-31 May
Class M    01/01/01
Class X    01/01/01
Proton     01/01/01
PCAF       Green
IV.  Penticton 10.7 cm Flux
Observed           28 May 068
Predicted   29 May-31 May  068/068/068
90 Day Mean        28 May 071
V.  Geomagnetic A Indices
Observed Afr/Ap 27 May  002/003
Estimated Afr/Ap 28 May  010/010
Predicted Afr/Ap 29 May-31 May  008/010-008/010-008/008
VI.  Geomagnetic Activity Probabilities 29 May-31 May
A.  Middle Latitudes
Active                15/15/15
Minor storm           05/05/05
Major-severe storm    01/01/01
B.  High Latitudes
Active                30/30/25
Minor storm           10/10/05
Major-severe storm    05/05/05