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Title:
Double layers
Authors:
Block, L. P.
Affiliation:
Royal Inst. of Tech., Stockholm (Sweden).
Publication:
Presented at the Nobel Symp. on the Phys. of the Hot Plasma in the Magnetosphere, Kiruna, Swed., 2-4 Apr. 1975
Publication Date:
05/1975
Category:
Geophysics
Origin:
STI
NASA/STI Keywords:
GAS DISCHARGES, SHEATHS, BIRKELAND CURRENTS, E REGION, EARTH IONOSPHERE, EARTH MAGNETOSPHERE, ELECTRIC FIELDS, ENERGY DISSIPATION, EQUIPOTENTIALS, MAXWELL EQUATION, PLASMA HEATING, VLASOV EQUATIONS
Bibliographic Code:
1975phpm.symp....2B

Abstract

The basic properties of electrostatic double layers observed in laboratory gaseous discharges are reviewed. Theoretical results from both macroscopic 4-fluid theory and microscopic, Vlasov, theory are described and found to be in fairly good agreement. Recent work on Penrose-stable double layers, as well as double layers with oblique electric and magnetic fields are described. Applications to Birkeland currents in the ionosphere are made. It was found that kilovolt potential which drops along the geomagnetic field can be produced in the topside ionosphere by double layers. Anomalous turbulent resistivity effects are unlikely to produce large parallel potential drops since that would lead to excessive heating of the ambient plasma. Since double layers are laminar structures they will not produce heat until the accelerated particles are stopped in the lower much denser E-layer.
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