| 释义 |
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. |