Two‐dimensional correlation functions for density and magnetic field fluctuations in magnetosheath turbulence measured by the Cluster spacecraft
作者： J‐S He , E Marsch , C‐Y Tu , Q‐G Zong , S Yao
DOI: 10.1029/2010JA015974
关键词: Field (physics) 、 Magnetosheath 、 Turbulence 、 Physics 、 Correlation function (statistical mechanics) 、 Astrophysical plasma 、 Classical mechanics 、 Computational physics 、 Magnetic field 、 Anisotropy 、 Population
摘要: [1] Knowledge of multidimensional correlation functions is crucial for understanding the anisotropy turbulence. The two-dimensional (2-D) spatial (SCFs) obtained in previous studies space plasma turbulence were restricted to large-length scales and covered a limited angular domain two-point separation vector with respect mean magnetic field. Here we aim derive 2-D SCFs smaller-length scale nearly full distribution fluctuations number density field magnetosheath We use Cluster four-spacecraft measurements temporally spatially varying background construct SCFs. find that function shows pattern similar fluctuations, both which appear be composed two populations, whereby major population extends along coordinate parallel (S∥) minor one deviates toward perpendicular (S⊥). This implies energy seems cascade, inertial range close ion scale, mostly transverse meanwhile partly (i.e., k⊥ ≫ k∥).
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