Waveforms of large-amplitude Langmuir oscillations were recorded by th
e Wind spacecraft in the Earth's upstream electron foreshock region. W
e present some statistics of the waveforms and discuss them in the con
text of various saturation mechanisms. In particular, it is found that
the value of E-peak/E-rms is not large, as previously suggested, and
that the largest-amplitude Langmuir waveforms are generally somewhat s
inusoidal and lack structure on small spatial scales. The measured pro
bability distribution of electric field amplitude and dimensionless en
ergy suggest that some stochastic process may play a role in wave gene
ration. The values of dimensionless energy needed to arrest Langmuir w
ave collapse occur with very small probability and the value of E-peak
/E-rms for large fields suggests that, statistically, Langmuir wave co
llapse is not an important process in the terrestrial foreshock.