:Product: 0520RSGA.txt
:Issued: 2011 May 20 2200 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 140 Issued at 2200Z on 20 May 2011
IA.  Analysis of Solar Active Regions and Activity from  19/2100Z
to 20/2100Z:  Solar activity was very low.  The three spotted regions
on the disk, 1214 (S24W70), 1216 (S16E19) and 1218 (S16E40) were all
unipolar and magnetically simple.
IB.  Solar Activity Forecast:  Solar activity is expected to remain
very low to low.  A slight chance for a C-class x-ray flare remains
for the next three days (21 May - 23 May).
IIA.  Geophysical Activity Summary 19/2100Z to 20/2100Z:
The geomagnetic field was quiet.  A weak sudden impulse (3nT) at the
Boulder magnetometer was observed at 20/0415Z.
IIB.  Geophysical Activity Forecast:  The geomagnetic field is
expected to remain predominantly quiet for the next three days (21
May - 23 May).
III.  Event Probabilities 21 May-23 May
Class M    01/01/01
Class X    01/01/01
Proton     01/01/01
PCAF       green
IV.  Penticton 10.7 cm Flux
Observed           20 May 084
Predicted   21 May-23 May  083/080/080
90 Day Mean        20 May 108
V.  Geomagnetic A Indices
Observed Afr/Ap 19 May  002/004
Estimated Afr/Ap 20 May  005/005
Predicted Afr/Ap 21 May-23 May  005/005-005/005-005/005
VI.  Geomagnetic Activity Probabilities 21 May-23 May
A.  Middle Latitudes
Active                10/10/05
Minor storm           01/01/01
Major-severe storm    01/01/01
B.  High Latitudes
Active                15/15/10
Minor storm           05/05/05
Major-severe storm    01/01/01