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Fig. 1.

image

Overview of solar wind data at the perihelion of Helios1 in 1975. (a) Radial component of the velocity; (b) radial component of the magnetic field; (c) proton density; (d) proton temperature: T (red dashed line) and T (blue solid line); (e) absolute value of the 30 min averaged cross-helicity; (f) radial distance. The coloured bands denote the three different regimes of solar wind, namely Alfvénic slow (green), fast (orange), and non-Alfvénic slow (violet) winds.

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