The interplanetary magnetic field has been south oriented for the last
several hours (as of 0100Z Dec 10) This opens magnetic portals which can
permit charged particles from the sun to penetrate deep into the ionosphere
activating propagation anamolies which may include some unusual top band
openings
The Bz field in this chart shows the part of the interplanetary magnetic field
that affects the portals
http://www.swpc.noaa.gov/ace/MAG_24h.html
This presentation explains magnetic portal and related studies underway
http://www.youtube.com/watch?v=y3_vW5yrNek
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Topband reflector - topband@contesting.com
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