Shocklets, SLAMS, and field‐aligned ion beams in the terrestrial foreshock

@article{Wilson2012ShockletsSA,
  title={Shocklets, SLAMS, and field‐aligned ion beams in the terrestrial foreshock},
  author={Lynn Bruce Wilson and Andriy Koval and David Gary Sibeck and Adam Szabo and Cynthia A. Cattell and Justin C. Kasper and Bennett A. Maruca and Marc P. Pulupa and Chadi S. Salem and Mark Q. Wilber},
  journal={Journal of Geophysical Research: Space Physics},
  year={2012},
  volume={118},
  pages={957 - 966}
}
We present Wind spacecraft observations of ion distributions showing field‐aligned beams (FABs) and large‐amplitude magnetic fluctuations composed of a series of shocklets and short large‐amplitude magnetic structures (SLAMS). The FABs are found to have Tb ~ 80 − 850  eV, Vb/Vsw ~ 1. 3 − 2. 4, T⊥,b/T∥,b ~ 1–8, and nb/no ~ 0.2–11%. Saturation amplitudes for ion/ion resonant and non‐resonant instabilities are too small to explain the observed SLAMS amplitudes. We show two examples where groups of… 
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