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Parallel electric fields: variations in space and time on auroral field lines

Published online by Cambridge University Press:  01 February 2008

J. VEDIN  and
K. RÖNNMARK
J. VEDIN
Affiliation:
Department of Physics, Umeå University, SE-90187 Umeå, Sweden ([email protected])
K. RÖNNMARK
Affiliation:
Department of Physics, Umeå University, SE-90187 Umeå, Sweden ([email protected])
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Abstract

We present results from a particle–fluid simulation of auroral electrons and discuss the distribution of parallel electric fields along auroral field lines and the processes occurring during the build up of these electric fields. Neglecting field-aligned ion dynamics, the main potential drop has a width of about 5000, km and is centered at an altitude of roughly 5000, km. We find that the gradient in the potential becomes steeper and the build up of the potential drop becomes faster if the temperature of the magnetospheric electrons is lower.

Type
Papers
Information
Journal of Plasma Physics , Volume 74 , Issue 1 , February 2008 , pp. 53 - 64
Copyright
Copyright © Cambridge University Press 2007

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