Current carrying properties of double layers and low frequency auroral fluctuations

Physics

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Auroral Arcs, Ion Currents, Ionospheric Conductivity, Ionospheric Currents, Plasma Currents, Plasma Layers, Charge Carriers, Current Density, Electron Mobility, Ion Injection, Ion Motion, Low Frequencies, Plasma Conductivity, Temporal Distribution

Scientific paper

A summary is given of a systematic parametric study in which the ion-transit time effects on double-layer fluctuations are investigated in a series of numerical simulations involving several lengths of finite extent plasmas. Typical values of ion drift velocities both smaller and larger than the ion-thermal speed on the high potential end of the simulation plasma are given. It is shown that the link between the electron-current fluctuations and ion-transit time is the Langmuir criterion for the existence of double layers. The time period of the recurring phenomena depends on the ion dynamics; for ions entering the simulation plasma in such a way that the ion drift velocity is less than approximately the ion thermal speed, the time period is governed by the ion transit time from the location of ion injection to the location of the double layer.

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