Journal
ANNALES GEOPHYSICAE
Volume 30, Issue 1, Pages 81-95Publisher
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/angeo-30-81-2012
Keywords
Magnetospheric physics; Auroral phenomena; Space plasma physics; Nonlinear phenomena; Numerical simulation studies
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Funding
- CNRS-INSU
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In the auroral zone of the Earth, the electron acceleration by Alfven waves is sometimes seen as a precursor of the non-propagating acceleration structures. In order to investigate how Alfven waves could generate non-propagating electric fields, a series of simulations of counter-propagating waves in a homogeneous medium is presented. The waves propagate along the ambient magnetic field direction. It is shown that non-propagating electric fields are generated at the locus of the Alfven waves crossing. These electric fields have a component orientated along the direction of the ambient magnetic field, and they generate a significant perturbation of the plasma density. The non-linear interaction of down and up-going Alfven waves might be a cause of plasma density fluctuations (with gradients along the magnetic field) on a scale comparable to those of the Alfven wavelengths. The present paper is mainly focused on the creation process of the non-propagating parallel electric field.
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