Physics – Space Physics
Scientific paper
2011-07-22
Annales Geophysicae 29 (2011) 613-617
Physics
Space Physics
7 pages
Scientific paper
10.5194/angeo-29-613-2011
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.
Bale Stuart D.
Dudok de Wit Thierry
Krasnoselskikh Vladimir
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