standard refraction

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standard refraction [′stan·dərd ri′frak·shən]

(electromagnetism)

Refraction which would occur in an idealized atmosphere in which the index of refraction decreases uniformly with height at a rate of 39 × 10^-6per kilometer; standard refraction may be included in ground wave calculations by use of an effective earth radius of 8.5 × 10⁶meters, or ⁴⁄₃ the geometrical radius of the earth.

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