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202Re: SSN.dat File

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  • bill_w4zv
    Apr 21 11:52 AM
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      George Lane: "In short, use the smoothed International Sunspot Number
      (SSN) values in VOACAP -- or in any other interface program that uses
      VOACAP as their calculation engine. Smoothed SSNs can be found from
      the National Geophysical Data Center at:


      They maintain the (predicted) SSN figures based on the Lincoln-McNish
      smoothing function. These are the sunspot numbers used in the database
      reduction for the worldwide ionospheric maps used in IONCAP and now


      These are the same SSN.dat numbers used in my previous post.

      73, Bill W4ZV
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