“…Meanwhile, the problem of estimating statistical characteristics of the decameter signal in the ionospheric radio channel can be solved using a model of randomly inhomogeneous ionosphere with generalized (integral) features. In this regard, significant results have been obtained due to the introduction of concepts about the effective correlation ellipsoid that approximately describes random irregularities of the medium [Gusev, Ovchinnikova, 1980;Vologdin et al, 2007Vologdin et al, , 2012Afanasiev et al, 2009] and significantly simplifies analytical calculations of statistical moments of a signal. Although the ionosphere is a multiscale randomly inhomogeneous medium and features a power spectrum of ir-regularities, in some cases, when calculating the lowest moments of trajectory characteristics of a signal, we can use a Gaussian correlation ellipsoid of irregularities with effective parameters.…”