Figure 1

Permittivity dispersion of plasma medium in an external magnetic field. \(\varepsilon _+\) (\(\varepsilon _-\)) is the permittivity of right-handed (left-) circular polarization under an external magnetic field of 0.054 T. \(\varepsilon _z\) is for polarization along the z direction. The real and imaginary parts of the permittivity are shown in blue and red, respectively. Both \(\varepsilon _{+}\) and \(\varepsilon _{-}\) are affected by the cyclotron resonance at \(f_{\rm c} = 1.5\,\text {GHz}\), while \(\varepsilon _z\) is unaffected and remains to be given by the standard Drude model.