Fig. 7.

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Decomposition of the magnetic field fluctuations into parallel and transverse fluctuations. Top panels: Solar Orbiter’s spectra for total magnetic field fluctuations (limegreen dashed lines) separated into compressible parallel (pink solid lines) and incompressible transverse fluctuations (green solid lines) in the upstream (left panels) and downstream (right panels) regions, respectively. The upstream and downstream proton cyclotron frequency in plasma frame fcu and fcd and the equivalent frequency in the spacecraft frame and are shown as well. Power-law fitting is performed in the frequency range [0.01, 0.2] Hz. Bottom panels: spectra of the normalized magnetic helicity spectra σm calculated using both the Blackman-Tukey (black lines) and Morlet wavelet (red lines) methods.

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