ENHANCED MAGNETIC COMPRESSIBILITY AND ISOTROPIC SCALE INVARIANCE AT SUB-ION LARMOR SCALES IN SOLAR WIND TURBULENCE

By Khurom H. Kiyani, S. Chapman, Fouad Sahraoui, B. Hnat, Olivier Fauvarque, Y. Khotyaintsev. 2010

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The anisotropic nature of solar wind magnetic turbulence fluctuations is investigated scale by scale using high cadence in situ magnetic field measurements from the Cluster and ACE spacecraft missions. The data span five decades in scales from the inertial range to the electron Larmor radius. In contrast to the inertial range, there is a successive increase toward isotropy between parallel and transverse power at scales below the ion Larmor radius, with isotropy being achieved at the electron Larmor radius. In the context of wave-mediated theories of turbulence, we show that this enhancement in magnetic fluctuations parallel to the local mean background field is qualitatively consistent with the magnetic compressibility signature of kinetic Alfvén wave solutions of the linearized Vlasov equation. More generally, we discuss how these results may arise naturally due to the prominent role of the Hall term at sub-ion Larmor scales. Furthermore, computing higher-order statistics, we show that the full statistical signature of the fluctuations at scales below the ion Larmor radius is that of a single isotropic globally scale-invariant process distinct from the anisotropic statistics of the inertial range.

Subfields: Astronomy and Astrophysics, Molecular Biology

View Paper: https://www.semanticscholar.org/paper/202c4e5e4d54eae7aece6ce0d5bcd1cc1d2c7b99

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In Astronomy and Astrophysics

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Citations in the corpus

SCALING OF THE ELECTRON DISSIPATION RANGE OF SOLAR WIND TURBULENCE (2013, background): “…one assumes that turbulence below the ion scale is dominated essentially by highly oblique KAWs, as suggested by several SW observations (Bale et al. 2005; Sahraoui et al. 2009, 2010a; Salem et al. 2012; Podesta & Tenbarge 2012; Kiyani et al. 2013; Chen et al. 2013), such a dependence could exist.”
Nature of Kinetic Scale Turbulence in the Earth's Magnetosheath (2016, background): “…Quataert 2010; He et al. 2011; Podesta & Gary 2011; Yao et al. 2011a; Howes et al. 2012; Klein et al. 2012; TenBarge et al. 2012; Chen et al. 2013c,b; Kiyani et al. 2013; Bruno & Telloni 2015; Telloni et al. 2015; Verscharen et al. 2017), and similarly in numerical simulations (e.g., Howes et…”