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Magnetic energy and helicity spectra, 2μ0EM(k) and k|HM(k)|, respectively, for two separate distance intervals (first and third panels). Furthermore, both spectra are scaled by 4πR2 before averaging within each distance interval above and below 2.8 AU, respectively. The relative magnetic helicity, kHM(k)/2μ0EM(k), is plotted separately (second and fourth panels) together with its cumulative average starting from the low wavenumber end. The zero line is shown as dashed. Adapted from Brandenburg et al. (2011).
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