地球弓形激波朗缪尔波包波长的确定
Determining the wavelength of Langmuir wave packets at the Earth's bow shock
摘要：
朗缪尔波在等离子体中的传播对密度波动很敏感。这种波动可能导致在其反射点附近具有几乎相反波数的波对共存。利用WIND卫星的高频电场测量，我们首次确定了高能电子束在地球电子前震上游产生的强烈朗缪尔波包的波长。令人惊讶的是，发现波长比标准理论预期的值大2到3倍。这些值与太阳风等离子体中强不均匀性的存在相一致，而不是与弱光束不稳定性的影响相一致。
英文摘要：
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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