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| Titel |
On the existence of Alfvén waves in the terrestrial foreshock |
| VerfasserIn |
J. P. Eastwood, A. Balogh, E. A. Lucek, C. Mazelle, I. Dandouras |
| 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 ; 21, no. 7 ; Nr. 21, no. 7, S.1457-1465 |
| Datensatznummer |
250014654
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| Publikation (Nr.) |
 copernicus.org/angeo-21-1457-2003.pdf |
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| Zusammenfassung |
The terrestrial foreshock
is characterised by the existence of large amplitude ultra low frequency waves.
The majority of such waves are observed to be left-handed in the spacecraft
frame, but are in fact intrinsically right-handed and have been identified as
fast-magnetosonic waves. More rarely observed are waves that are right-handed
in the spacecraft frame. Cluster four spacecraft observations of such waves are
presented and analysed using multi-spacecraft techniques; in particular the
k-filtering/wave telescope technique is used. The waves are found to be
left-handed and propagating sunwards in the plasma rest frame, and are,
therefore, identified as Alfvénic. The convection of the waves anti-sunward in
the solar wind flow causes the observed polarisation to be reversed. Generation
mechanisms are discussed.
Key words. Interplanetary physics (MHD
waves and turbulence; planetary bow shocks) – Space plasma physics (wave
particle interactions) |
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