Solutions of non-dimensional dispersion relation without stratification, Eq. (42). Upper and lower panels: real and imaginary part of k, scaled with as a function of the ratio between the collisional and wave frequencies, scaled with ρ₀. Solutions labeled as “S” (dashed lines) are for S magnetic field; solutions labeled “B” (solid lines) are for B magnetic field. The vertical dotted lines mark values of ω = ν_in (F_c), ω = ν_ni (F_n), and ω = 2π/1 (F₁) for the 1 s period wave.