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| Titel |
Non-propagating electric and density structures formed through non-linear interaction of Alfvén waves |
| VerfasserIn |
F. Mottez |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 30, no. 1 ; Nr. 30, no. 1 (2012-01-09), S.81-95 |
| Datensatznummer |
250017165
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| Publikation (Nr.) |
 copernicus.org/angeo-30-81-2012.pdf |
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| Zusammenfassung |
| In the auroral zone of the Earth, the electron acceleration by Alfvén waves
is sometimes seen as a precursor of the non-propagating acceleration
structures. In order to investigate how Alfvén 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 Alfvén 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 Alfvén waves might be a cause of plasma density fluctuations (with
gradients along the magnetic field) on a scale comparable to those of the
Alfvén wavelengths. The present paper is mainly focused on the creation
process of the non-propagating parallel electric field. |
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