modified index of refraction

modified index of refraction

[′mäd·ə‚fīd ′in‚deks əv ri′frak·shən]
(meteorology)
An atmospheric index of refraction mathematically modified so that when its gradient is applied to energy propagation over a hypothetical flat earth, it is substantially equivalent to propagation over the true curved earth with the actual index of refraction. Also known as modified refractive index; refractive modulus.
References in periodicals archive ?
where [M.sub.0] is the modified index of refraction at the sea surface, usually taken as 330 M-units, [c.sub.1] and [h.sub.1] represent the slope and thickness of the base layers, and [c.sub.2] and [h.sub.2] represent the slope and thickness of the inversion layers.
where m is the modified index of refraction, F and [F.sup.-1] are, respectively, the Fourier transform and inverse Fourier transform, P = k sin [eta] is the vertical wave number or the spatial frequency, and [eta] is the propagation angle from the horizontal direction.

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