Journal of Radio Electronics. eISSN 1684-1719. 2025. №12

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DOI: https://doi.org/10.30898/1684-1719.2025.12.15

APPLICATION OF VARIOUS IONOSPHERE MODELS 
TO STUDY RADIO WAVE PROPAGATION 
IN SMOOTH INHOMOGENEOUS ISOTROPIC 
AND MAGNETOACTIVE PLASMA

A.S. Kryukovsky, A.D. Didinkul, E.V. Mikhaleva, D.V. Rastyagaev

Russian New University
105005, Russia, Moscow, Radio str., 22

The paper was received November 13, 2025.

Abstract. The Hamilton-Lukin bicharacteristic method was used to study the propagation characteristics of decameter-range radio waves in the Earth's ionosphere over medium-range paths. Four electron density models were constructed using the NeQuick 2 package: winter, day; winter, night; summer, day; and summer, night. Ray paths and distance-frequency characteristics (DFCs) were calculated, and it was shown that the S-shaped curves appearing in the DFCs are explained by the formation of a caustic cusp due to the self-intersection of ray flows during the projection of bicharacteristics from phase space to configuration space. DFC behavior was compared between simulations with and without the influence of the Earth's magnetic field.

Key words: radio wave propagation, distance-frequency characteristics, ionograms, bicharacteristics, cusp, ordinary and extraordinary waves, isotropic approximation.

Financing: The work was supported by the Russian Science Foundation grant No. 25-22-00096.

Corresponding author: Dmitry Vladimirovich Rastyagaev, rdv@rosnou.ru

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For citation:

Kryukovsky A.S., Didinkul A.D., Mikhaleva E.V., Rastyagaev D.V. Application of various ionosphere models to study radio wave propagation in smooth inhomogeneous isotropic and magnetoactive plasma. // Journal of Radio Electronics. – 2025. – №. 12. https://doi.org/10.30898/1684-1719.2025.12.15 (In Russian)