Transionospheric Synthetic Aperture Imaging by Mikhail Gilman Erick Smith & Semyon Tsynkov

Author:Mikhail Gilman, Erick Smith & Semyon Tsynkov
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

The propagation of radio waves in magnetized plasmas has been extensively covered in the literature, see, e.g., [18, 89, 92–94, 144]. In this section, we discuss a specific propagation scenario that is used for our subsequent analysis. We consider a cold plasma with the external magnetic field being the only source of anisotropy. Other large-scale effects such as the ionospheric winds and polarization fields, see, e.g., [91, Section 2.9] and [145], are not taken into account. Moreover, we ignore the collisions of particles in the ionosphere because according to [91, Section 8.​3.​2], the main effect of collisions on the Faraday rotation is due to the different rates of absorption for the ordinary and extraordinary waves. For the model parameters presented in Table 1.​1, this effect should be very small, whereas for much lower incident frequencies, Appleton-Lassen or Sen-Wyller models [89, Section 3.​12] can be used.

We begin with the full Maxwell equations for electromagnetic waves in plasma without extraneous sources (ρ ext = 0 and ) [cf. equations (3.​3)]:

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