[NZ4O Spaceweather] Discussion Of Solar Space & Geomagnetic Weather Conditions

[Thomas F Giella NZ4O]

Published on Friday September 28, 2012 at 1300 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-

The daily sunspot number stayed above 100 for only two days and has now 
slipped to 97. Yesterday there was some moderate to strong strength 
east-west radio wave propagation openings on 10 meters in both hemispheres.

A long duration C3.7 solar flare occurred on Thursday September 27, 2012. 
The solar flare released a coronal mass ejection (CME) which should arrive 
at Earth on or around Sunday September 30th. The solar flare also triggered 
an energetic proton storm greater than 10 MeV (10+0). The energetic proton 
storm is causing 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.

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
NZ4O MF/HF/6M Radiowave Propagation Forecast: http://www.solarcycle24.org