Schematic diagram showing the simulation geometry and the diverging magnetic field B, Plasma is injected into the diffusion region through the PIW.
(a) Equipotential contours, (b) corresponding density (n = ni ∼ ne) contours with color bars, (c) color map of EX, and (d) radial cut of EX at X = 50. Note the thin filamentary structures in (a)–(c) along the enhanced density region near the conical surface of the density structure in (b).
(a) Ion X-VX phase plot and Phi(X,Z = 30), (b) ion X-VZ phase plot at t = 8000. (c) The same as (a) and (b) but at t = 18 250.
(a) Ion X-VX phase plot and Phi(X,Z = 75), (b) ion X-VZ phase plot at t = 18 250, (c) and (d) same as (a) and (b) but at z = 125.
(a) Temporal variation of Ex at point A and (b) its frequency power spectrum; note that Ex(t) is strongly modulated waveform. The frequency spectrum extends from ion cyclotron to above the lower hybrid frequency. (c) The spectrum in (b) replotted with horizontal axis normalized by ΩiA.
Ex(t) at points (a) B, (b) C, (c) D, and (d) E. These time series are quite different from the one at point A; after t = 10 000ωpi0 −1, the ion cyclotron oscillations strongly persist, and the other oscillations are comparatively much weaker.
Frequency spectra of the oscillations at points B–D as labeled.
Ion velocity distribution functions in the vicinity of points A–D as labeled in the panels.
Electron velocity distribution functions at points A–D as labeled.
Field and Plasma parameters at points A–E.
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