Fig. 2.

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Spectral features of magnetic field observations. Upper panel: trace of the Fourier power spectral densities (PSDs) for PSP (black line) and BepiColombo (red line) orbits. The PSD at the PSP orbit follows the Iroshnikov-Kraichnan scaling of MHD turbulence f−3/2, while at the BepiColombo orbit, the Kolmogorov scaling of fluid turbulence f−5/3 is observed. Lower panel: helicity spectrum hm at both PSP (a) and BepiColombo (b) locations, respectively. At the PSP orbit, hm follows a f−5/2 power-law, while at the BepiColombo orbit, a f−8/3 scaling is observed. The gray lines are the 95% confidence intervals for both panels.
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