Comment on “Mode Conversion of Waves in the Ion-Cyclotron Frequency Range in Magnetospheric Plasmas”

A Comment on the Letter by Y. O. Kazakov and T. Fülöp, Phys. Rev. Lett. 111, 125002 (2013). The authors of the Letter offer a Reply.

Figure 1

(a) Normalized IIH resonance (${\omega }_S$), LH cutoff (${\omega }_L$), and RH cutoff (${\omega }_R$) frequencies as a function of $k_{\parallel }$ at Earth. Here, $B_0(R=6.6R_E)\approx 108\mathrm{nT}$, $N_e=10{\mathrm{cm}}^{-3}$, and $N_H/N_e:N_{He}/N_e=9:1$. (b) The perpendicular refractive index ($n_{\perp }$) of FW at Earth magnetosphere for $k_{\parallel }/k_{\parallel ,\text{cr}}=0.285$ (blue lines with circles), and 0.93 (red lines), as marked in magenta and green squares in Fig. 1, respectively. The magnetic field at magnetic equator is assumed, such as $B_0(R)=3.1\times 10^{-5}(R/R_E{)}^{-3}\mathrm{T}$.