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High-resolution measurements of the electron distributions and the determination of their third-order velocity moments will allow us to investigate the radial profiles of the electron heat flux as well as its evolution through free-streaming, collisions, and kinetic instabilities (see Gary et al., 1999; Bale et al., 2013; Landi et al. 2014). Furthermore, the observation of truncated electron distributions can lead to a quantification of exospheric effects and their contribution to the solar-wind acceleration by comparison with exospheric-model predictions (Pierrard et al., 1999; Lie-Svendsen & Leer, 2000).

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