Coexistence of self-similar and anomalous scalings in turbulent small-scale solar magnetic fields

TL;DR

This paper demonstrates that both self-similar and anomalous scaling behaviors coexist in the turbulent magnetic fields of the solar photosphere, with different scaling laws depending on the entropy production sign.

Contribution

It provides evidence of simultaneous self-similar and anomalous scalings in solar magnetic turbulence, linking scaling behavior to entropy production sign.

Findings

Positive entropy fluctuations follow linear MHD turbulence scaling

Negative entropy fluctuations exhibit anomalous scaling

Coexistence of different scaling regimes in solar magnetic turbulence

Abstract

We report an evidence that self-similar and anomalous scalings coexist in a turbulent medium, particularly in fluctuations of the magnetic field flux density in magnetized plasma of the solar photosphere. The structure function scaling exponents in the inertial range have been analyzed for fluctuations grouped according to the sign of the path-dependent stochastic entropy production. It is found that the scaling exponents for fluctuations with the positive entropy production follow the phenological linear dependence for the magnetohydrodynamic turbulence. For fluctuations with the negative entropy production, the scaling is anomalous.