The role of electron-ion instabilities in the development of phase space holes from localized self-consistent electric fields (double layers)

Details The role of electron-ion instabilities in the development of phase space holes from localized self-consistent electric fields (double layers) The role of electron-ion instabilities in the development of phase space holes from localized self-consistent electric fields (double layers)

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm32b..11g&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM32B-11

Physics

Geophysics

2159 Plasma Waves And Turbulence, 2407 Auroral Ionosphere (2704), 2471 Plasma Waves And Instabilities, 2483 Wave/Particle Interactions

Scientific paper

One-dimensional Vlasov simulations have shown that a localized self-consistent electric field (double layer) can develop in a current-carrying plasma when an initial density depression is imposed (Newman, contributed paper, this conference; Newman, et al. 2001). The localized field accelerates electrons in one direction and ions (much more slowly) in the opposite direction. The accelerated electrons interact with a slower electron component to create growing waves via a two-electron-stream instability. These waves then trap the electron beams and create fast-moving electron holes. On a slower time scale, after the ions have been accelerated in the opposite direction an electron-ion instability occurs. The growing waves move slowly in the direction of the ions and trap both ions and electrons - leading to an alternating train of ion and electron phase space holes (Goldman, et al, 2001). We interpret the simulations in terms of these electron-ion instabilities and further describe how yet another electron-ion instability, (a cold Buneman instabilty) may play a role in the destruction of the double layer. D.L. Newman, M.V. Goldman, R.E. Ergun and A. Mangeney, "Formation of Double Layers and Electron Holes in a Current Driven Space Plasma, submitted to Phys. Rev. Lett., 2001 M.V. Goldman D.L. Newman and R.E. Ergun, "Phase space holes due to electron and ion beams accelerated by a current-driven potential ramp," submitted to Nonlinear Processes in Geophysics, 2001 This work was supported by NASA and NSF.

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