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The propagation of Langmuir waves in plasmas is known to be sensitive todensity fluctuations. Such fluctuations may lead to the coexistence of wavepairs that have almost opposite wave-numbers in the vicinity of theirreflection points. Using high frequency electric field measurements from theWIND satellite, we determine for the first time the wavelength of intenseLangmuir wave packets that are generated upstream of the Earth's electronforeshock by energetic electron beams. Surprisingly, the wavelength is found tobe 2 to 3 times larger than the value expected from standard theory. Thesevalues are consistent with the presence of strong inhomogeneities in the solarwind plasma rather than with the effect of weak beam instabilities.

Determining the wavelength of Langmuir wave packets at the Earth's bow shock