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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  T   b   ~ 80 − 850  eV,  V   b  / V   sw   ~ 1. 3 − 2. 4,  T  ⊥, b  / T  ∥, b   ~ 1–8, and  n   b  / n   o   ~ 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 SLAMS can act like a local quasi‐perpendicular shock reflecting ions to produce the FABs, a scenario distinct from the more common production at the quasi‐perpendicular bow shock. The SLAMS exhibit a foot‐like magnetic enhancement with a leading magnetosonic whistler train, consistent with previous observations. Strong ion and electron heating are observed within the series of shocklets and SLAMS with temperatures increasing by factors ≳ 5 and ≳ 3, respectively. Both the core and halo electron components show strong perpendicular heating inside the feature.

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