Compressible turbulence in the planetary magnetosheaths and the solar wind: turbulent energy cascade rate.

HADID, L. Z.; ANDRÉS, NAHUEL; ET AL.

San Francisco

Congreso; AGU FALL MEETING 2023; 2023

Over the past three decades, compressible turbulence has been a subject of active researchin space physics, particularly in relation to the solar wind's physics (e.g., fast wind heating),interstellar medium (in cold molecular clouds), and other astrophysical and spacephenomena. Understanding its properties in different plasma environments like planetarymagnetospheres and the fast and slow solar wind is crucial, especially its role in energydissipation. This talk provides a comprehensive overview of compressible turbulence, drawingfrom in situ data collected by spacecraft such as Cassini, Cluster, THEMIS/ARTEMIS,MAVEN, and Parker Solar Probe.The presentation covers various studies focusing on estimating the compressible turbulentcascade rates in a compressible medium, like the Earth magnetosheath, at MHD scales. Datafrom Cluster and THEMIS/ARTEMIS is utilized for this purpose [Banerjee & Galtier, PRE,2013, Banerjee et al., ApJL, 2016, Hadid, ApJ, 2017, Hadid et al., PRL, 2018]. The work isthen extended to sub-ion scales using the exact law of compressible Hall MHD turbulence,providing a complete estimation of |εC | covering the MHD and the kinetic regimes using MMSdata [Andrés & Sahraoui, PRE, 2018, Andrés et al., PRL, 2019]. Moreover, the presentationshowcases recent data from the Parker Solar Probe/NASA solar mission, revealing the radialevolution of the turbulent cascade rate in the inner heliosphere from the Sun (approximately0.2 A.U.) up to Mars (around 1.5 A.U.) [Andrés et al., ApJ, 2021, Andrés et al., A&A, 2021,Romanelli et al., ApJ, 2022]. Finally, a first estimation of the local incompressible MHD energytransfer rate in the solar wind in the presence of discontinuities is presented [David et al., ApJ,2022].