Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 090 Issued at 2200Z on 31 Mar 2005
IA. Analysis of Solar Active Regions and Activity from 30/2100Z
to 31/2100Z: Solar activity remains at very low levels. Regions 747
(S07E23) and 748 (N09E59) are both HSX alpha spot groups that were
numbered today. Region 745 (N11W80) continues a slow decay and is
now spotless.
IB. Solar Activity Forecast: Solar activity is expected to continue
at very low levels.
IIA. Geophysical Activity Summary 30/2100Z to 31/2100Z:
The geomagnetic field was at quiet to unsettled levels. The greater
than 2 MeV electron flux at geosynchronous orbit reached high levels
today.
IIB. Geophysical Activity Forecast: The geomagnetic field is
expected to be at quiet to unsettled levels through 1 April.
Isolated minor storming conditions are expected late on 2 April due
to the onset of a recurrent coronal hole high speed stream and
should continue through 3 April.
III. Event Probabilities 01 Apr-03 Apr
Class M 01/01/01
Class X 01/01/01
Proton 01/01/01
PCAF green
IV. Penticton 10.7 cm Flux
Observed 31 Mar 077
Predicted 01 Apr-03 Apr 080/085/085
90 Day Mean 31 Mar 097
V. Geomagnetic A Indices
Observed Afr/Ap 30 Mar 006/009
Estimated Afr/Ap 31 Mar 005/008
Predicted Afr/Ap 01 Apr-03 Apr 008/010-015/015-015/025
VI. Geomagnetic Activity Probabilities 01 Apr-03 Apr
A. Middle Latitudes
Active 20/30/30
Minor storm 05/10/10
Major-severe storm 01/05/05
B. High Latitudes
Active 20/30/40
Minor storm 05/10/20
Major-severe storm 01/05/10
73 & GUD DX,
Thomas F. Giella, KN4LF
Retired Space & Atmospheric Weather Forecaster
Plant City, FL, USA
Grid Square EL87WX
Lat & Long 27 58 33.6397 N 82 09 52.4052 W
kn4lf@arrl.net
Contesting Propagation eReflector:
http://lists.contesting.com/mailman/listinfo/propagation
HC-DX Propagation Channel:
http://www.hard-core-dx.com/index.php?topic=Propagation
KN4LF Daily Solar Space Weather & Geomagnetic Data Archive:
http://www.kn4lf.com/kn4lf5.htm
KN4LF Daily LF/MF/HF Radio Propagation Outlook:
http://www.kn4lf.com/kn4lf6.htm
KN4LF HF/MF Radio Propagation Theory Notes: http://www.kn4lf.com/kn4lf8.htm
KN4LF Amateur & SWL Radio History: http://www.kn4lf.com/index.htm
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