Fig. 2
Comparison between the analytical instability conditions (Eqs. (4) and (5)) and fast solar wind data (V SW > 600 km s−1; Matteini et al. 2007) from the Helios at 0.3 AU (top panel) and 0.9 AU (middle panel), and from Ulysses at 1.5–2.5 AU (bottom panel). Top panel: magenta: ζ = π∕13, red ζ =π∕10, blue: ζ = π∕7.5, green: ζ = π∕6, yellow: ζ = π∕4. Middle panel: magenta: ζ = π∕10, red ζ =π∕8, blue: ζ = π∕7, green: ζ = π∕6, yellow: ζ = π∕4. Bottom panel: magenta: ζ = π∕10, red ζ =π∕7, blue: ζ = π∕5, green: ζ = π∕4, yellow: ζ = π∕3.5.
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