The recent, unusual propagation conditions on 160 seem to have a direct
correlation to the unusually weak “wind from the sun”
http://science.nasa.gov/headlines/y2008/23sep_solarwind.htm
During the peaks of northern North American to Europe openings the auroral
torus was nearly non-existent as was visible on this site.
http://www.swpc.noaa.gov/pmap/AnimateN.html
Studying the various charts and displays gives an interesting look at the sun’s
influence on earth conditions
This site has a convenient speedometer type display of the current solar wind:
http://sohowww.nascom.nasa.gov/
Maybe, by looking at the information on these sites during the 160 meter band
openings we can get some sort of handle on what is going on.
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