Report of Solar Geophysical Activity (RSGA)

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast
SDF Number 262 Issued at 2200Z on 19 Sep 2013

IA.  Analysis of Solar Active Regions and Activity from 18/2100Z to
19/2100Z: 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
19/0817Z from Region 1850 (N09E75). There are currently 7 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 (20 Sep,
21 Sep, 22 Sep).

IIA.  Geophysical Activity Summary 18/2100Z to 19/2100Z: The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed, as measured by the ACE spacecraft, reached a peak speed of
600 km/s at 18/2127Z. Total IMF reached 7 nT at 18/2137Z. The maximum
southward component of Bz reached -5 nT at 19/0715Z. Electrons greater
than 2 MeV at geosynchronous orbit reached a peak level of 414 pfu.
IIB.  Geophysical Activity Forecast: The geomagnetic field is expected
to be at quiet to unsettled levels on day one (20 Sep) and quiet levels
on days two and three (21 Sep, 22 Sep).

III.  Event probabilities 20 Sep-22 Sep
Class M    05/05/05
Class X    01/01/01
Proton     01/01/01
PCAF       green

IV.  Penticton 10.7 cm Flux
Observed           19 Sep 108
Predicted   20 Sep-22 Sep 110/110/110
90 Day Mean        19 Sep 111

V.  Geomagnetic A Indices
Observed Afr/Ap 18 Sep  006/007
Estimated Afr/Ap 19 Sep  010/012
Predicted Afr/Ap 20 Sep-22 Sep  007/008-005/005-005/005

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

Space Weather Message Code: ALTEF3
Serial Number: 2087
Issue Time: 2013 Sep 20 1236 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2013 Sep 20 1220 UTC
Station: GOES13
 

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/NOAAscales

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Radio Events Observed 19 Sep 2013
A.  245 MHz Bursts
Start  End   Peak Flux  Time of Peak  Duration
2316   2316    140          2316        0000  
2325   2325    160          2325        0000  
B.  245 MHz Noise Storms
No 245 MHz Noise Storms Observed.