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| Titel |
Observations of linear and nonlinear processes in the foreshock wave evolution |
| VerfasserIn |
Y. Narita, K.-H. Glassmeier, M. Franz, Y. Nariyuki, T. Hada |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 14, no. 4 ; Nr. 14, no. 4 (2007-07-09), S.361-371 |
| Datensatznummer |
250012236
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| Publikation (Nr.) |
 copernicus.org/npg-14-361-2007.pdf |
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| Zusammenfassung |
| Waves in the foreshock region are studied
on the basis of a hypothesis that the
linear process first excites the
waves and further wave-wave nonlinearities
distribute scatter the energy of the
primary waves into a number of daughter waves.
To examine this wave evolution scenario,
the dispersion relations,
the wave number spectra of the
magnetic field energy, and
the dimensionless cross helicity
are determined from the observations
made by the four Cluster spacecraft.
The results confirm that
the linear process is the ion/ion right-hand
resonant instability, but the wave-wave
interactions are not clearly identified.
We discuss various reasons why the test for
the wave-wave nonlinearities fails,
and conclude that the higher order statistics
would provide a direct evidence for
the wave coupling phenomena. |
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