2025/06/04 by M. Brodiano, Fouad Sahraoui, Brodiano, Maia +11
Engineering · Physics and Astronomy · #FOS: Physical sciences #Fluid dynamics and aerodynamics studies #Ionosphere and magnetosphere dynamics #Plasma Physics (physics.plasm-ph) #Solar and Space Plasma Dynamics #Solar and Stellar Astrophysics (astro-ph.SR) #Space Physics (physics.space-ph)
paper · pdf · doi:10.48550/arxiv.2506.04366
openalex publication_date 2025/06/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present a statistical, observational study of the 1/f range of solar wind turbulence, where f denotes frequency, using in situ data from the Parker Solar Probe (PSP). We compute the energy cascade rate using the third order law of incompressible magnetohydrodynamic (MHD) turbulence, incorporating expansion terms to account for solar wind dynamics. Our results reveal a 1/τ dependence of the energy cascade rate, where τ is the temporal lag, within the 1/f range, in contrast to the constant cascade rate in the inertial range. To explain this behavior, we propose a new intermittent model predicting a 1/ℓ scaling of the cascade rate, where ℓ represents the spatial lag. The analysis of the probability density function (PDF) of magnetic field increments confirms the intermittent nature of the parallel fluctuation component, whereas the perpendicular fluctuations are found to be quasi Gaussian. These findings provide new insights into energy transfer processes in the 1/f range of solar wind turbulence, with potential applications in planetary magnetosheaths.