Relationship between field-aligned current density and potential difference of current-driven double layer

Details Relationship between field-aligned current density and potential difference of current-driven double layer Relationship between field-aligned current density and potential difference of current-driven double layer

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....9112113y&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Nov. 1, 1986, p. 12113-12117.

Physics

4

Auroral Zones, Current Density, Digital Simulation, Electric Potential, Field Aligned Currents, Plasma Currents, Plasma Layers, Electron Distribution, Geomagnetism, High Altitude, Plasma Frequencies

Scientific paper

Relationship between field-aligned current density and potential difference of current-driven double layer is studied by one-dimensional numerical simulations. The simulation domain is assumed to be located at a high altitude (more than about several earth radii) along the auroral field lines. The plasma sheet boundary supplies a plasma with number density n. Only the electrons injected from this boundary are allowed to have a drift velocity v(d), which carries an upward field-aligned current. The double layer potential is spontaneously produced by the space charge self-consistently developed inside the simulation domain. For a given drift velocity v(d), the relationship between the total current density J and the potential difference phi(0) across the simulation domain is obtained by changing the number density n of the injection current. The results show that the double layer starts to be formed when the current density significantly exceeds the thermal current density of the ambient electrons and the potential difference phi(0) increases with increasing current density J. It is also shown that at a given number density of the injection current the potential difference phi(0) increases with increasing drift velocity v(d).

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