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Area Radio wave propagation / Tropospheric propagation including the influence of the ground

IEV ref705-05-41

Symbol
k

en
effective Earth-radius factor
ratio of the effective radius of the Earth to the actual Earth radius

Note 1 – This factor k is related to the vertical gradient dn/dh of the refractive index n and to the actual Earth radius a by the equation:

k= 1 1+a dn dh MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaceaaciWacmGadaGadeGabaGaaqaaaOqaaiaadUgacqGH9aqpdaWcaaqaaiGacgdaaeaaciGGXaGaey4kaSIaamyyamaalaaabaGaciizaiaad6gaaeaaciGGKbGaamiAaaaaaaaaaa@3E52@

Note 2 – For an atmosphere having a standard refractivity gradient the value of k is taken as 4/3, corresponding to an effective radius of the Earth of approximately 8 500 km.


fr
facteur multiplicatif du rayon terrestre, m
rapport du rayon terrestre équivalent au rayon réel de la Terre

Note 1 – Le facteur multiplicatif k du rayon terrestre est lié au gradient vertical dn/dh de l'indice de réfraction et au rayon réel a de la Terre par la relation:

k= 1 1+a dn dh MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaceaaciWacmGadaGadeGabaGaaqaaaOqaaiaadUgacqGH9aqpdaWcaaqaaiGacgdaaeaaciGGXaGaey4kaSIaamyyamaalaaabaGaciizaiaad6gaaeaaciGGKbGaamiAaaaaaaaaaa@3E52@

Note 2 – Pour une atmosphère ayant un gradient normal du coïndice, la valeur de k est prise égale à 4/3, ce qui correspond à un rayon terrestre équivalent voisin de 8 500 km.


ar
عامل نصف القطر الفعال للأرض

de
Krümmungsfaktor, m

es
factor del radio equivalente de la Tierra

it
fattore del raggio terrestre (simbolo: k)

ko
유효 지구 반경 계수

ja
等価地球半径係数

pl
współczynnik skutecznego promienia Ziemi

pt
factor do raio terrestre equivalente

sv
jordradiefaktor

Publication date: 1995-09
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