Report of Solar Geophysical Activity

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast
SDF Number 260 Issued at 2200Z on 17 Sep 2015

IA.  Analysis of Solar Active Regions and Activity from 16/2100Z to
17/2100Z: Solar activity has been at moderate levels for the past 24
hours. The largest solar event of the period was a M1 event observed at
17/0940Z from Region 2415 (S20W16). There are currently 3 numbered
sunspot regions on the disk.
IB.  Solar Activity Forecast: Solar activity is expected to be low with
a chance for M-class flares on days one, two, and three (18 Sep, 19 Sep,
20 Sep).

IIA.  Geophysical Activity Summary 16/2100Z to 17/2100Z: The geomagnetic
field has been at quiet to active levels for the past 24 hours. Solar
wind speed, as measured by the ACE spacecraft, reached a peak speed of
535 km/s at 17/0729Z. Total IMF reached 6 nT at 17/1820Z. The maximum
southward component of Bz reached -5 nT at 16/2300Z. Electrons greater
than 2 MeV at geosynchronous orbit reached a peak level of 6939 pfu.
IIB.  Geophysical Activity Forecast: The geomagnetic field is expected
to be at quiet to unsettled levels on day one (18 Sep) and quiet to
active levels on days two and three (19 Sep, 20 Sep).

III.  Event probabilities 18 Sep-20 Sep
Class M    25/25/25
Class X    05/05/05
Proton     01/01/01
PCAF       green

IV.  Penticton 10.7 cm Flux
Observed           17 Sep 107
Predicted   18 Sep-20 Sep 110/110/110
90 Day Mean        17 Sep 104

V.  Geomagnetic A Indices
Observed Afr/Ap 16 Sep  009/009
Estimated Afr/Ap 17 Sep  012/012
Predicted Afr/Ap 18 Sep-20 Sep  009/008-009/012-014/016

VI.  Geomagnetic Activity Probabilities 18 Sep-20 Sep
A.  Middle Latitudes
Active                20/25/30
Minor Storm           05/10/15
Major-severe storm    01/01/01
B.  High Latitudes
Active                20/15/15
Minor Storm           25/30/30
Major-severe storm    25/35/45