Lack of Detailed Balance at Sub-ion Scales in Turbulent Solar Wind

Abstract A notable feature of turbulence in solar wind is the presence of an additional power-law spectral domain at scales below the ion inertial length. This spectral domain has been attributed to a distinct turbulent regime involving alternative wave modes. However, this interpretation is still up for debate, as is the occurrence of dissipation at these scales. Here, we present a methodology to investigate the irreversible dynamics and the lack of detailed balance for the energy of magnetic field fluctuations at ion/sub-ion scales via the asymmetric time-correlation function using high-resolution magnetic field measurements from the Parker Solar Probe mission. The preliminary results are discussed in relation to irreversibility and dissipation at ion/sub-ion scales.