:Product: 0521RSGA.txt
:Issued: 2016 May 21 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 Solar Geophysical Activity Report and Forecast
SDF Number 142 Issued at 2200Z on 21 May 2016

IA.  Analysis of Solar Active Regions and Activity from 20/2100Z to
21/2100Z: Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C1 event observed at
21/1400Z from Region 2546 (S07W21). There are currently 1 numbered
sunspot regions on the disk.
IB.  Solar Activity Forecast: Solar activity is expected to be very low
with a chance for a C-class flares on days one, two, and three (22 May,
23 May, 24 May).

IIA.  Geophysical Activity Summary 20/2100Z to 21/2100Z: The geomagnetic
field has been at quiet to minor storm levels for the past 24 hours.
Solar wind speed reached a peak of 545 km/s at 21/0520Z. Total IMF
reached 11 nT at 21/0541Z. The maximum southward component of Bz reached
-9 nT at 21/0630Z. Electrons greater than 2 MeV at geosynchronous orbit
reached a peak level of 612 pfu.
IIB.  Geophysical Activity Forecast: The geomagnetic field is expected
to be at quiet to minor storm levels on day one (22 May), quiet to
unsettled levels on day two (23 May) and quiet levels on day three (24
May).

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 098
Predicted   22 May-24 May 095/095/095
90 Day Mean        21 May 093

V.  Geomagnetic A Indices
Observed Afr/Ap 20 May  006/006
Estimated Afr/Ap 21 May  013/017
Predicted Afr/Ap 22 May-24 May  016/018-008/008-005/005

VI.  Geomagnetic Activity Probabilities 22 May-24 May
A.  Middle Latitudes
Active                35/20/10
Minor Storm           20/05/01
Major-severe storm    05/01/01
B.  High Latitudes
Active                10/15/15
Minor Storm           25/25/20
Major-severe storm    50/30/15