Classification of the ionosphere scintillation severity.
|Strong||(S4 > 1.0 or Phi60 > 0.8)|
|Moderate||(0.5 ≤ S4 ≤ 1.0 or 0.4 ≤ Phi60 ≤ 0.8)|
|Weak||(S4 < 0.5 or Phi60 < 0.4)|
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