Weak double layers in the auroral ionosphere

Details Weak double layers in the auroral ionosphere Weak double layers in the auroral ionosphere

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987lpb.....5..295h&link_type=abstract

(NASA, Conference on Double Layers in Plasmas, Huntsville, AL, Mar. 1986) Laser and Particle Beams (ISSN 0263-0346), vol. 5, May

Physics

Auroral Zones, Earth Ionosphere, Plasma Diagnostics, Plasma Layers, Hydrogen Plasma, Ion Distribution, Magnetohydrodynamic Stability, Plasma Currents, Plasma Drift

Scientific paper

Previous work on the evolution of weak double layers in a hydrogen plasma is extended to include H(+) and O(+) with relative drift. It is shown that ion hole formation can occur for smaller relative electron-ion drifts than seen in previous simulations, due to the hydrogen-oxygen two-stream instability. This leads to local modification of the ion distribution in phase space and a partial filling of the valley between the hydrogen and oxygen peaks, which would be expected at higher altitudes on auroral field lines. The observed velocity diffusion does not necessarily preclude ion hole and double layer formation in hydrogen in the ion-acoustic regime. These simulation results are consistent with the observation of weak double layers above an altitude of 3000 km on auroral field lines.

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