Incompressive Energy Transfer in the Earth's Magnetosheath: Magnetospheric Multiscale Observations

Abstract

Using observational data from the \emph{Magnetospheric Multiscale} (MMS) Mission in the Earth's magnetosheath, we estimate the energy cascade rate using different techniques within the framework of incompressible magnetohydrodynamic (MHD) turbulence. At the energy containing scale, the energy budget is controlled by the von Kármán decay law. Inertial range cascade is estimated by fitting a linear scaling to the mixed third-order structure function. Finally, we use a multi-spacecraft technique to estimate the Kolmogorov-Yaglom-like cascade rate in the kinetic range, well below the ion inertial length scale. We find that the inertial range cascade rate is almost equal to the one predicted by the von Kármán law at the energy containing scale, while the cascade rate evaluated at the kinetic scale is somewhat lower, as anticipated in theory~\citep{Yang2017PoP}. Further, in agreement with a recent study~\citep{Hadid2018PRL}, we find that the incompressive cascade rate in the Earth's magnetosheath is about $1000$ times larger than the cascade rate in the pristine solar wind.

Accepted for publication in Astrophysical Journal

References in corpus (10)

• Measurement of the electric fluctuation spectrum of magnetohydrodynamic turbulence
• Universality of solar wind turbulent spectrum from MHD to electron scales
• Observation of inertial energy cascade in interplanetary space plasma
• Anisotropy of Solar Wind Turbulence between Ion and Electron Scales
• Magnetic Reconnection and Intermittent Turbulence in the Solar Wind
• Solar wind turbulent spectrum at plasma kinetic scales
• Nature of Kinetic Scale Turbulence in the Earth's Magnetosheath
• Electron scale structures and magnetic reconnection signatures in the turbulent magnetosheath
• Propinquity of current and vortex structures: effects on collisionless plasma heating
• Variability Of The Magnetic Field Power Spectrum In The Solar Wind At Electron Scales

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