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| Titel |
Alfvén waves in the foreshock propagating upstream in the plasma rest frame: statistics from Cluster observations |
| VerfasserIn |
Y. Narita, K.-H. Glassmeier, S. Schäfer, U. Motschmann, M. Franz, I. Dandouras, K.-H. Fornacon, E. Georgescu, A. Korth, H. Rème, I. Richter |
| 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 ; 22, no. 7 ; Nr. 22, no. 7 (2004-07-14), S.2315-2323 |
| Datensatznummer |
250014922
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| Publikation (Nr.) |
 copernicus.org/angeo-22-2315-2004.pdf |
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| Zusammenfassung |
| We statistically study various properties of low-frequency waves
such as frequencies, wave numbers, phase velocities, and polarization
in the plasma rest frame in the terrestrial foreshock.
Using Cluster observations the wave telescope or k-filtering
is applied to investigate wave numbers and rest frame frequencies.
We find that most of the foreshock waves
propagate upstream along the magnetic field
at phase velocity close to the Alfvén velocity.
We identify that frequencies are around
0.1xΩcp and wave numbers are around
0.1xΩcp/VA, where
Ωcp is the proton cyclotron frequency and VA is the Alfvén velocity.
Our results confirm the conclusions drawn from ISEE observations
and strongly support the existence of Alfvén waves
in the foreshock. |
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