Time series of relevant parameters: solar wind speed, V_sw [km s⁻¹] (a); v-b correlation coefficient, ρ_vb (b), computed at 30 min scale (b); V and B variances normalised to the square of their respective mean fields, (black) and (red) (c); magnetic field vector displacement, |δB|/⟨B⟩ (d); radial component, B_R [nT], in RTN coordinate system (e); angle between the magnetic field direction and the radial direction, θ_BR (f); and plasma beta, β (g). The red and blue boxes identify the main portion of the stream and the rarefaction region, respectively. The green box identifies a region characterised by the presences of structures, which will be studied in detail in Sect. 3.4.