Intermittency and Multifractality of Elsasser Variables in Turbulent Solar Wind

A natural laboratory for studying turbulence in space plasmas is the Solar Wind. The existence of intermittency in the inertial range, where the plasma dynamics can be explained within the framework of the magnetohydrodynamic model, is one of the primary characteristics of the observed turbulence. The emergence of anomalous scaling characteristics and multifractality for both magnetic and velocity field variations is the evidence of intermittency. Here, we examine the multifractal nature of the Elsasser variables demonstrating the various intermittent degrees of z± variations using data from Solar Orbiter.  Additionally, by examining the joint-multi fractal spectrum, we investigate the relationship between the singularity spectra of z± fluctuations. In relation to the asymmetry of the observed singularity spectra, the significance of stochastic energy redistribution throughout the inertial cascade is also discussed.

This research is supported by the Space It Up! project funded by the Italian Space Agency, ASI, and the Ministry of University and Research, MUR, under contract n. 2024-5-E.0—CUP n. I53D24000060005.