Table 3

Autoscaling results of the oblique ionograms data set of 549 ionograms recorded between September 25, 2015 and October 18, 2015. Accurate cases (ǀMUFOISAMUFOperatorǀ≤0.5 MHz) are a subset of acceptable cases (ǀMUFOISAMUFOperatorǀ≤1.5 MHz).

  Scaled by OIASA Discarded by OIASA

No. of cases % No. of cases %
The Operator did not scale the MUF 7 1.5 51 58.6
The operator scaled the MUF 455 98.5 36 41.4
Total 462 87
  Scaled by OIASA

No. of cases %
Accurate 215 47.3
Acceptable (including accurate) 372 81.8
Poor 83 18.2
Total 455

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