Physics – Plasma Physics
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....8810081s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Dec. 1, 1983, p. 10081-10090.
Physics
Plasma Physics
15
Auroras, Current Density, Plasma Layers, Space Plasmas, Electron Distribution, Field Aligned Currents, Ion Distribution, Plasma Dynamics, Plasma Physics, Plasma Potentials, Spatial Distribution, Temporal Distribution, Transient Response
Scientific paper
The characteristics of double layers driven by an applied potential drop and by an injected current into a plasma are compared. In the latter case the potential drop across the double layer appears because of the formation of a virtual cathode. The double layers formed by the two mechanisms show striking similarities with regard to their structure, temporal evolution, and dynamics. However, in the case of current-driven double layers a large energization of ions trapped in the virtual cathode region is observed. Such a large energization of trapped ions is not seen in the case of the potential-drop driven double layers. The interrelation between the field-aligned currents and potential drops for the auroral plasma is discussed. For current-driven double layers, it is found that the current density is proportional to the 1/2 power of the potential drop.
Schunk Robert W.
Singh Navinder
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