standard refraction

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 × 10-6 per kilometer; standard refraction may be included in ground wave calculations by use of an effective earth radius of 8.5 × 106 meters, or ⁴⁄₃ the geometrical radius of the earth.
References in periodicals archive ?
The surface velocities inferred from standard refraction measurements, and also the surface velocity of 4.4 km/s, as mentioned above, represent certain simplifications of the velocity profile at shallow depths.

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