Phase space cascade in the inner Heliosphere

The velocity distribution functions (VDFs) of space plasma typically present non-Maxwellian shapes due to the very low level of collisisionality. The small scale gradients of the VDFs could be the key feature to explain heating and dissipation, inibiting the revesibility of the energy exchange between fields and particles once a significant level of complexity is achieved.
In this work, we investigate the solar wind protons VDFs fine features and their relation to different measures of the real space turbulent cascade. We explore different solar wind regimes and heliocentrice distances by using both Parker Solar Probe and Solar Orbiter data.
These results, suggestive of the presence of a dual velocity-real space cascade, contribute to a better understanding of turbulence in space plasmas.