Topband: Lets do a study

[N7DF]

This site shows the interplanetary magnetic field as it impinges on earth's magnetic field for the last 7 days
 
http://www.swpc.noaa.gov/ace/MAG_7d.html
 
A somewhat simplified explanation of the meaning of the data is here 
 
http://spaceweather.com/glossary/imf.html
 
There was a clear correlation between thw Bz field and the sudden propagation in the 10 meter contest Sunday as it shifted from northern polarization (Bz+) to southern polarization (Bz-)
 
Looking back a few days there seems to be some correlations between some of the displayed  parameters with 160 meter conditions
 
If enough people collect data on the time and direction of 160 meter openings from their QTH we should be able to see if a pattern develops with changes in the polarization of the magnetic fields 
 
Initially it would appear that the 160 meter effects are primarily during rapid changes in the field directions while higher frequency effects follow the field stabalizing in a particular orientation