Table 1

Autoscaling results of the oblique ionograms data set of 576 ionograms recorded between May 2, 2015 and May 24, 2015. Accurate cases (ǀMUFOISAMUFOperatorǀ≤0.5 MHz) are a subset of acceptable cases (ǀMUFOISA−MUFOperatorǀ≤1.5 MHz).

Scaled by OIASA Discarded by OIASA

No. of cases % No. of cases %
The Operator did not scale the MUF 22 4.0 14 77.8
The operator scaled the MUF 536 96.0 4 22.2
Total 558 18
  Scaled by OIASA and the operator

No. of cases %
Accurate 166 31.0
Acceptable (including accurate) 367 68.5
Poor 169 31.5
Total 536  –

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