|      There is considerable misconception among the ham community
     about how magnetic storms are caused,though there is general
     recognition that high Kp or Ap index numbers generally spell 
     poor HF conditions - at least at mid latitudes.There is an 
     excellent web site that reviews the current state of knowledge
     at http://www.nas.edu/ssb/cover.html. (The ssb here refers to
     the Space Science Board - not single side band!) John. N3HBX.
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