Anisotropy of Solar Wind Turbulence in the Inner Heliosphere at Kinetic Scales: PSP Observations

被引：46

作者：

Duan, Die ^{[1
]}

He, Jiansen ^{[1
]}

Bowen, Trevor A. ^{[2
]}

Woodham, Lloyd D. ^{[3
]}

Wang, Tieyan ^{[4
]}

Chen, Christopher H. K. ^{[5
]}

Mallet, Alfred ^{[2
]}

Bale, Stuart D. ^{[2
,3
,5
,6
]}

机构：

[1] Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China

[2] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA

[3] Imperial Coll London, Blackett Lab, London SW7 2AZ, England

[4] Rutherford Appleton Lab, RAL Space, Harwell, Berks, England

[5] Queen Mary Univ London, Sch Phys & Astron, London E1 4NS, England

[6] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2021年 / 915卷 / 01期

关键词：

PLASMA TURBULENCE;

D O I：

10.3847/2041-8213/ac07ac

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The anisotropy of solar wind turbulence is a critical issue in understanding the physics of energy transfer between scales and energy conversion between fields and particles in the heliosphere. Using the measurement of Parker Solar Probe (PSP), we present an observation of the anisotropy at kinetic scales in the slow, Alfvenic, solar wind in the inner heliosphere. The magnetic compressibility behaves as expected for kinetic Alfvenic turbulence below the ion scale. A steepened transition range is found between the inertial and kinetic ranges in all directions with respect to the local background magnetic field direction. The anisotropy of k(perpendicular to) >> k(parallel to) is found evident in both transition and kinetic ranges, with the power anisotropy P-perpendicular to/P-parallel to > 10 in the kinetic range leading over that in the transition range and being stronger than that at 1 au. The spectral index varies from alpha(t parallel to) = -5.7 +/- 1.0 to alpha (t perpendicular to) = -3.7 +/- 0.3 in the transition range and alpha(k parallel to) = -3.12 +/- 0.22 to alpha(k perpendicular to) = -2.57 +/- 0.09 in the kinetic range. The corresponding wavevector anisotropy has the scaling of k(parallel to) similar to k(perpendicular to)(0.71 +/- 0.17) in the transition range, and changes to k(parallel to) similar to k(perpendicular to)(0.38 +/- 0.09) <i in the kinetic range, consistent with the kinetic Alfvenic turbulence at sub-ion scales.

引用

页数：7

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