Report of Solar Geophysical Activity (RSGA)

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast
SDF Number 122 Issued at 2200Z on 02 May 2013

IA.  Analysis of Solar Active Regions and Activity from 01/2100Z to
02/2100Z: 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
02/0510Z from Region 1731 (N09W31). There are currently 5 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 (03 May, 04 May,
05 May).

IIA.  Geophysical Activity Summary 01/2100Z to 02/2100Z: 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
509 km/s at 02/0007Z. Total IMF reached 5 nT at 01/2101Z. The maximum
southward component of Bz reached -5 nT at 01/2101Z. Electrons greater
than 2 MeV at geosynchronous orbit reached a peak level of 759 pfu.
IIB.  Geophysical Activity Forecast: The geomagnetic field is expected
to be at quiet to unsettled levels on days one and two (03 May, 04 May)
and quiet to active levels on day three (05 May).

III.  Event probabilities 03 May-05 May
Class M    30/30/30
Class X    05/05/05
Proton     05/05/05
PCAF       green

IV.  Penticton 10.7 cm Flux
Observed           02 May 149
Predicted   03 May-05 May 155/155/150
90 Day Mean        02 May 115

V.  Geomagnetic A Indices
Observed Afr/Ap 01 May  016/028
Estimated Afr/Ap 02 May  012/012
Predicted Afr/Ap 03 May-05 May  007/008-008/008-010/012

VI.  Geomagnetic Activity Probabilities 03 May-05 May
A.  Middle Latitudes
Active                10/10/15
Minor Storm           01/01/05
Major-severe storm    01/01/01
B.  High Latitudes
Active                15/20/15
Minor Storm           15/20/25
Major-severe storm    10/10/25

Radio Events Observed 02 May 2013
A.  245 MHz Bursts
Start  End   Peak Flux  Time of Peak  Duration
0501   0505    350          0501        0004  
0936   0936    100          0936        0000  
2044   2044    100          2044        0000  
B.  245 MHz Noise Storms
No 245 MHz Noise Storms Observed.

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2013 May 03 1120 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.