Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2023, Vol. 20, No. 4, pp. 299-307
Decametric radio diagnostics of fine structure of ionosphere from high-orbit artificial satellites
N.T. Afanasiev
1 , D.S. Lukyantsev
1 , A.B. Tanaev
1 , S.O. Chudaev
1, 2 1 Irkutsk State University, Irkutsk, Russia
2 Institute of Solar-Terrestrial Physics SB RAS, Irkutsk, Russia
Accepted: 29.06.2023
DOI: 10.21046/2070-7401-2023-20-4-299-307
To restore the fine structure of the ionosphere according to the data of multi-frequency radio translucence from a high-orbit satellite, a system of integral relations for the second statistical moments of group and phase delays of decameter radio signals was obtained. The calculation of statistical moments is carried out in the approximation of geometric optics using the mathematical apparatus of perturbation theory. The relations take into account strong variations in the trajectories between the receiving and emitting points. The generalized model of the fine structure of the ionosphere is considered in the form of a correlation ellipsoid of irregularities with effective parameters to solve the inverse problem. The model is consistent with changes in the average ionosphere, given by the composite Gaussian-exponential height profile of the permittivity, and takes into account the possible spatial localization of the field of random irregularities. The system of integral relations is solved for unknown parameters of the correlation ellipsoid. The integral coefficients, expressed in terms of fundamental solutions and average ray trajectories of the two-point trajectory problem for various operating transmission frequencies, are calculated to restore the ellipsoid. The calculation of the average trajectories is carried out by the method of shooting at the receiving point for each operating frequency. The spatial dynamics of the parameters of the ionosphere fine structure is determined by using the measurement data of the group and phase delays statistical moments of satellite decameter radio signals received by a network of receivers located on the Earth’s surface.
Keywords: diagnostics, decameter band, ionosphere, multi-frequency radio translucence, signals, fluctuations, irregularities, spacecrafts
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