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Acceleration of Auroral Particles by Electric Double Layers

  • Lars P. Block
Part of the Astrophysics and Space Science Library book series (ASSL, volume 32)

Abstract

Recent observations of precipitating particles and motions of auroral forms indicate that auroral particles are accelerated by electric fields directed along the magnetic field. Such electric fields have also been observed. It is argued that large field aligned potential drops should sometimes be concentrated in thin double layers (sheaths). Properties and consequences of such sheaths are reviewed and compared with evidence from several rocket and satellite observations.

It is pointed out that parallel electric fields due to anomalous resistivity may not produce secondary energy distribution peaks, nearly monoenergetic precipitation, and anisotropics since anomalous resistivity is due to scattering processes that should wipe out such peaks. It seems more likely that the acceleration occurs in sheaths, and the velocity distributions may then be partly smoothed out by instabilities.

Keywords

Electric Double Layer Pitch Angle Plasma Sheet Potential Drop Field Reversal 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© D. Reidel Publishing Company, Dordrecht, Holland 1972

Authors and Affiliations

  • Lars P. Block
    • 1
  1. 1.Division of Plasma PhysicsRoyal Institute of TechnologyStockholmSweden

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