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| Titel |
Determining the wavelength of Langmuir wave packets at the Earth's bow shock |
| VerfasserIn |
V. V. Krasnoselskikh, T. Dudok de Wit, S. D. Bale |
| 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 ; 29, no. 3 ; Nr. 29, no. 3 (2011-03-28), S.613-617 |
| Datensatznummer |
250016996
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| Publikation (Nr.) |
 copernicus.org/angeo-29-613-2011.pdf |
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| Zusammenfassung |
| The propagation of Langmuir waves in plasmas is known to be sensitive to
density fluctuations. Such fluctuations may lead to the coexistence of wave
pairs that have almost opposite wave-numbers in the vicinity of their
reflection points. Using high frequency electric field measurements from the
WIND satellite, we determine for the first time the wavelength of intense
Langmuir wave packets that are generated upstream of the Earth's electron
foreshock by energetic electron beams. Surprisingly, the wavelength is found
to be 2 to 3 times larger than the value expected from standard theory. These
values are consistent with the presence of strong inhomogeneities in the
solar wind plasma rather than with the effect of weak beam instabilities. |
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