Excitation of chorus-like waves by temperature anisotropy in dipole research experiment (DREX): A numerical study Project supported by the National Natural Science Foundation of China (Grant Nos. 41674165, 41631071, 41474142, and 41674174) and the China Postdoctoral Science Foundation (Grant No. 2015M570283). |
(color online) (a), (c), (e) Normalized power spectrum densities varying in the frequency domain with different parallel thermal velocities. (b), (d), (f) Spatial profile and time evolutions of the wave amplitude with different parallel thermal velocities, respectively. The hot plasma frequency ωph = 1 and the cold plasma frequency ωpe = 8 are the same for the three cases. Other parameters are: w∥ = 0.05, w⊥ = 0.25 for panel (a); w∥ = 0.1, w⊥ = 0.4 for panel (c); and w∥ = 0.2, w⊥ = 0.75 for panel (e). |