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184Re: [dxatlas] 90-day SSN data for HamCAP

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  • bill_w4zv
    Apr 9, 2005
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      I wrote:

      > How can IonoProbe's computed 90-day SSN possibly be 47? This is
      > different by nearly a factor of two!

      Could IonoProbe's calculation be off by one year? I notice 47 is very
      close to the SSN numbers for this time last year:

      2004 52.0 49.3 47.1 45.6 43.9 41.7 40.2 39.2 37.5

      ftp://ftp.ngdc.noaa.gov/STP/SOLAR_DATA/SUNSPOT_NUMBERS/SMOOTHED

      And the average of 49.3, 47.1, and 45.6 is 47.3. Maybe the logic of
      the calculation has an error somewhere in its data collection.

      73, Bill (...using 29 for now)
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