Anisotropy of Magnetic Field Spectra at Kinetic Scales of Solar Wind Turbulence as Revealed by the Parker Solar Probe in the Inner Heliosphere

Huang, Suming; Xu, S. B.; Zhang, J.; Sahraoui, Fouad; Andrés, Nahuel; He, Jiansen; Yuan, Zhigang; Deng, Xiaohua; Jiang, K.; Wei, Yong; Xiong, Qian; Wang, Z.; Yu, Lei; Lin, R. T.

doi:10.3847/2041-8213/ac5f02

Cited by 16 publications

(17 citation statements)

References 60 publications

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“…The observation from the Parker Solar Probe (PSP) mission is giving a vital contribution to our research area whereas till now only observations are being reported in the range of 0.17 AU to 0.25AU. A study of the data obtained by PSP shows that the power spectra are steepening in the range of −3.2 to −5.8,as reported by Huang et al (2022). As this PSP continues to follow its path, it will get closer to the solar corona and continue to provide us with more data.…”

Section: Numerical Simulation and Resultssupporting

confidence: 54%

Nonlinear Interaction of a 3D Kinetic Alfvén Wave with a Null Point and Turbulence Generation in the Solar Corona

et al. 2022

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In the present paper, we have studied the nonlinear Kinetic Alfvén Waves (KAW) in the vicinity of the null point. We have considered the nonlinearity due to ponderomotive effects associated with KAW in the solar corona. A 3D model equation representing the dynamics of KAW is developed in this Null point scenario. Using numerical methods, we have solved the model equation for solar corona parameters. The pseudospectral method and the finite difference method have been applied to tackle spatial integration and temporal evaluation, respectively. The outcome of the simulation demonstrates the formation of localized structures. With the evolution of time, these localized structures become more chaotic. Chaotic structures (turbulent) can efficiently transfer energy. The power spectrum of these turbulent structures shows the Kolmogorov spectral index of nearly − 5 3 in the inertial range followed by a steeper spectrum of nearly −3.3 (in the range of −2 to −4). These structures also lead to the generation of the current sheet. To understand the physics of our model, we have also done a semi-analytical study for our model equation. Semi-analytical calculations reveal that the current sheet structures have scale sizes of the order of ion gyro-radius. The relevance of this investigation to the current observations by Parker Solar Probe has also been discussed.

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Section: Numerical Simulation and Resultssupporting

confidence: 54%

Nonlinear Interaction of a 3D Kinetic Alfvén Wave with a Null Point and Turbulence Generation in the Solar Corona

et al. 2022

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“…Inertial range spectral anisotropy has been investigated by (Huang et al 2022;Wu et al 2022), who used slow solar wind data from E1 of PSP to show that the spectral indices are close to −5/3 and −3/2 in the parallel and perpendicular direction, respectively. (Wu et al 2022) also compared the anisotropic spectral properties of the slow wind stream sampled by PSP during E1 to a fast wind, V sw ≈ 770 km s −1 , Ullyses stream at 1.48 au and concluded that the differences between the near-Sun and near-Earth solar wind likely result from the existence of two sub-ranges in the inertial range, with the one closer to kinetic scales (∼ 30d i − 300d i ) displaying a radial steepening, while the one at larger scales remains unchanged.…”

Section: Discussionmentioning

confidence: 99%

On the evolution of the Anisotropic Scaling of Magnetohydrodynamic Turbulence in the Inner Heliosphere

Sioulas¹,

Velli²,

Huang³

et al. 2023

Preprint

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We analyze a merged Parker Solar Probe (P SP ) and Solar Orbiter (SO) dataset covering heliocentric distances 13 R R 220 R to investigate the radial evolution of power and spectral-index anisotropy in the wavevector space of solar wind turbulence. Our results show that anisotropic signatures of turbulence display a distinct radial evolution when fast, V sw ≥ 400 km s −1 , and slow, V sw ≤ 400 km s −1 , wind streams are considered. The anisotropic properties of slow wind in Earth orbit are consistent with a "critically balanced" cascade, but both spectral-index anisotropy and power

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“…However, detailed comparisons are beyond the scope of the current study. Recent studies also indicate correlation anisotropy (Cuesta et al 2022) and anisotropy of the energy spectrum (Huang et al 2022;Zhang et al 2022) in the PSP datasets, which may suggest anisotropy of nonlinear energy transfer. More evidence has been shown in Andrés et al (2022), which examines variations of third-order law with decomposition into parallel and perpendicular components using PSP data.…”

Section: Cascade Rate and Single Spacecraft Samplingmentioning

confidence: 91%

Strategies for Determining the Cascade Rate in MHD Turbulence: Isotropy, Anisotropy, and Spacecraft Sampling

Wang

Chhiber

Adhikari

et al. 2022

ApJ

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Exact laws for evaluating cascade rates, tracing back to the Kolmogorov “4/5” law, have been extended to many systems of interest including magnetohydrodynamics (MHD), and compressible flows of the magnetofluid and ordinary fluid types. It is understood that implementations may be limited by the quantity of available data and by the lack of turbulence symmetry. Assessment of the accuracy and feasibility of such third-order (or Yaglom) relations is most effectively accomplished by examining the von Kármán–Howarth equation in increment form, a framework from which the third-order laws are derived as asymptotic approximations. Using this approach, we examine the context of third-order laws for incompressible MHD in some detail. The simplest versions rely on the assumption of isotropy and the presence of a well-defined inertial range, while related procedures generalize the same idea to arbitrary rotational symmetries. Conditions for obtaining correct and accurate values of the dissipation rate from these laws based on several sampling and fitting strategies are investigated using results from simulations. The questions we address are of particular relevance to sampling of solar wind turbulence by one or more spacecraft.

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Anisotropy of Magnetic Field Spectra at Kinetic Scales of Solar Wind Turbulence as Revealed by the Parker Solar Probe in the Inner Heliosphere

Cited by 16 publications

References 60 publications

Nonlinear Interaction of a 3D Kinetic Alfvén Wave with a Null Point and Turbulence Generation in the Solar Corona

Nonlinear Interaction of a 3D Kinetic Alfvén Wave with a Null Point and Turbulence Generation in the Solar Corona

On the evolution of the Anisotropic Scaling of Magnetohydrodynamic Turbulence in the Inner Heliosphere

Strategies for Determining the Cascade Rate in MHD Turbulence: Isotropy, Anisotropy, and Spacecraft Sampling

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