Ion-Acoustic Instabilities in a Multi-Ion Plasma

Figure 1

Plot of frequency 𝜔 versus wave vector 𝑘. Curve (a) is for 𝑢_⟂𝑠>𝑣_ts; drift speed 𝑢_⟂𝑠=420×10⁵cms⁻¹ and thermal spread 𝑣_ts=350×10⁵cms⁻¹; curve (b) is for 𝑢_⟂𝑠<𝑣_ts; 𝑢_⟂𝑠=100×10⁵cms⁻¹ and 𝑣_ts=320×10⁵cms⁻¹.