[P-EM16] Heliosphere and Interplanetary Space

[PEM16-10] Analysis and generalization of a two-modes model for solar wind magnetohydrodynamic turbulence

*Yasuhiro Nariyuki¹ (1.Faculty of Education, University of Toyama)

Keywords:turbulence, stochastic model, solar wind

The Taylor hypothesis[Taylor, Proc. Roy. Soc. (1938)] has widely been used to construct the wavenumber spectra of magnetohydrodynamic turbulence from one-point measurements in the solar wind plasma[e.g., Bruno+Carbone, Living Rev. Solar Phys. (2013); Marino+Sorriso-Valvo, Phys. Resp. (2023)]. On the other hand, as in-situ measurements in the inner-heliosphere such as Parker Solar Probe are progressing, the violation of the Taylor hypothesis has also been paid more attention [e.g., Narita, Ann. Geo. (2017); Bourouaine+Perez, ApJL (2018;2019;2020)]. As with experimental/numerical data of different physical systems [e.g., Carbone et al, PRL (2011); and references therein], it is suggested that Gaussian-like time decorrelation appears as a consequence of random sweeping[Bourouaine+Perez, ApJL (2018;2019)]. In this presentation, we discuss generalizations of the two-modes model for Elssaser variables. It is shown that in the high cross-helicity flow, the description using the Lagrangian derivative gives the same form as the one in Kaneda [1985]. Similarities with turbulence in different physical systems are also discussed.