[NZ4O Spaceweather] Discussion Of Solar Space & Geomagnetic Weather

[Thomas F Giella NZ4O]

Published on Sunday September 30, 2012 at 1430 UTC. Valid for the next 24 
hours.
1.) DISCUSSION OF SOLAR, SPACE & GEOMAGNETIC WEATHER CONDITIONS THAT CAN 
IMPACT MF & HF RADIO WAVE PROPAGATION IN A NEGATIVE MANNER-

A coronal mass ejection (CME) may arrive at earth's geomagnetic field later 
today causing geomagnetic storming that would lower the maximum useable 
frequency (MUF) and negatively impact radio wave propagation conditions on 
10 and 12 meters.

There are no significant impediments to good radio wave propagation on the 
HF bands of 20-10 meters as far as solar, space and geomagnetic weather. 
However the daily sunspot number needs to be higher than the present 70, as 
the higher the sunspot number (150 & >) the more ultraviolet light available 
to increase ionization in the F/F2 layer, for more consistent east-west 
radio wave propagation openings on 12 and 10 meters.

The energetic proton storm greater than 10 MeV >(10+0) is continuing to 
cause absorption of RF signals via the D layer on 160-30 meters on high 
latitude radio wave propagation paths (polar cap absorption) on the dayside 
of Earth. The storm is slowly subsiding.

Also on the medium frequency (MF) band there exists the normal absorption of 
RF signals in the D layer due to incoming cosmic rays and hard x-rays. Also 
the background x-ray flux is running in the C range so there is some 
additional absorption of RF signals in the D layer.



73 & GUD DX,
Thomas F. Giella NZ4O
Lakeland, FL, USA
nz4o at tampabay.rr.com

NZ4O Amateur Radio & SWL Autobiography: http://www.nz4o.com
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