Report of Solar Geophysical Activity

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast
SDF Number 141 Issued at 2200Z on 21 May 2015

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
21/0706Z from Region 2349 (S21W10). There are currently 3 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 levels for the past 24 hours. Solar wind speed,
as measured by the ACE spacecraft, reached a peak speed of 468 km/s at
21/1022Z. Total IMF reached 6 nT at 20/2106Z. The maximum southward
component of Bz reached -3 nT at 21/1130Z. Electrons greater than 2 MeV
at geosynchronous orbit reached a peak level of 146 pfu.
IIB.  Geophysical Activity Forecast: The geomagnetic field is expected
to be at quiet levels on days one, two, and three (22 May, 23 May, 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 102
Predicted   22 May-24 May 100/100/100
90 Day Mean        21 May 128

V.  Geomagnetic A Indices
Observed Afr/Ap 20 May  010/009
Estimated Afr/Ap 21 May  003/004
Predicted Afr/Ap 22 May-24 May  006/005-006/005-006/005

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