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Markovian Features of the Solar Wind at Subproton Scales
Author  Benella, Simone; Stumpo, Mirko; Consolini, Giuseppe; Alberti, Tommaso; Carbone, Vincenzo; Laurenza, Monica; 
Keywords  Parker Data Used; Solar wind; interplanetary turbulence; Magnetohydrodynamics; Heliosphere; Interplanetary physics; Space plasmas; 1534; 830; 1964; 711; 827; 1544; Physics  Space Physics; Physics  Data Analysis; Statistics and Probability; Physics  Plasma Physics 
Abstract  The interplanetary magnetic field carried out from the Sun by the solar wind displays fluctuations over a wide range of scales. While at large scales, say at frequencies lower than 0.11 Hz, fluctuations display the universal character of fully developed turbulence with a welldefined Kolmogorovlike inertial range, the physical and dynamical properties of the smallscale regime as well as their connection with the largescale ones are still a debated topic. In this work we investigate the nearSun magnetic field fluctuations at subproton scales by analyzing the Markov property of fluctuations and recovering basic information about the nature of the energy transfer across different scales. By evaluating the KramersMoyal coefficients we find that fluctuations in the subproton range are well described as a Markovian process with Probability Density Functions (PDFs) modeled via a FokkerPlanck (FP) equation. Furthermore, we show that the shape of the PDFs is globally scaleinvariant and similar to the one recovered for the stationary solution of the FP equation at different scales. The relevance of our results on the Markovian character of subproton scale fluctuations is also discussed in connection with the occurrence of turbulence in this domain. 
Year of Publication  2022 
Journal  \apjl 
Volume  928 
Number of Pages  L21 
Section  
Date Published  apr 
ISBN  
URL  
DOI  10.3847/20418213/ac6107 