# RADIAL EVOLUTION OF THE WAVEVECTOR ANISOTROPY OF SOLAR WIND TURBULENCE BETWEEN 0.3 AND 1 AU

@article{He2013RADIALEO,
title={RADIAL EVOLUTION OF THE WAVEVECTOR ANISOTROPY OF SOLAR WIND TURBULENCE BETWEEN 0.3 AND 1 AU},
author={Jiansen He and Chuanyi Tu and Eckart Marsch and Sofiane Bourouaine and Zhongtian Pei},
journal={The Astrophysical Journal},
year={2013},
volume={773},
pages={72}
}
• Published 4 February 2013
• Physics, Geology
• The Astrophysical Journal
We present observations of the power spectral anisotropy in the wavevector space of solar wind turbulence and study how it evolves in interplanetary space with increasing heliocentric distance. We use magnetic field measurements from the Helios 2 spacecraft within 1 AU. To derive the power spectral density (PSD) in the (k{sub Parallel-To }, k ) space based on single-satellite measurements is a challenging task that had not been accomplished previously. Here, we derive the spectrum PSD{sub 2D}(k…
39 Citations

## Figures from this paper

Wave Composition, Propagation, and Polarization of Magnetohydrodynamic Turbulence within 0.3 au as Observed by Parker Solar Probe
• Physics
• 2020
Turbulence, a ubiquitous phenomenon in interplanetary space, is crucial for the energy conversion of space plasma at multiple scales. This work focuses on the propagation, polarization, and wave
Spectral anisotropy of Elsässer variables in two-dimensional wave-vector space as observed in the fast solar wind turbulence
• Physics
• 2016
Intensive studies have been conducted to understand the anisotropy of solar wind turbulence. However, the anisotropy of Elsasser variables Z± in 2D wave-vector space has yet to be investigated. Here
Anisotropy of Solar Wind Turbulence in the Inner Heliosphere at Kinetic Scales: PSP Observations
• Physics
• 2021
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
Imprints of Expansion on the Local Anisotropy of Solar Wind Turbulence
• Physics
• 2015
We study the anisotropy of II-order structure functions (SFs) defined in a frame attached to the local mean field in three-dimensional (3D) direct numerical simulations of magnetohydrodynamic
Direct Measurement of Anisotropic and Asymmetric Wave Vector Spectrum in Ion-scale Solar Wind Turbulence
• Physics
• 2017
This analysis represents the first time that a simultaneous measurement of parallel and perpendicular spectral indices at both inertial and kinetic scales has been made directly in wave vector space,
A Study on Sunward Propagating Alfvénic Fluctuations With a Power Law Spectrum Observed by the Wind Spacecraft
• Physics
• 2017
Sunward propagating Alfvénic fluctuations with a power law spectrum (SAFP) have been recently observed in the upstream region of the Earth's bow shock. However, some physical properties of these
3D Feature of Self-correlation Level Contours at 1010 cm Scale in Solar Wind Turbulence
• Honghong Wu, Xin Wang
• Physics
The Astrophysical Journal
• 2019
The self-correlation level contours at $10^{10}\ \mathrm{cm}$ scale reveal a 2-D isotropic feature in both the slow solar wind fluctuations and the fast solar wind fluctuations. However, this 2-D
SCALE-DEPENDENT NORMALIZED AMPLITUDE AND WEAK SPECTRAL ANISOTROPY OF MAGNETIC FIELD FLUCTUATIONS IN THE SOLAR WIND TURBULENCE
• Physics, Environmental Science
• 2015
Turbulence in the solar wind was recently reported to be anisotropic, with the average power spectral index close to −2 when sampling parallel to the local mean magnetic field and close to −5/3 when
THE INFLUENCE OF INTERMITTENCY ON THE SPECTRAL ANISOTROPY OF SOLAR WIND TURBULENCE
• Physics
• 2014
The relation between the intermittency and the anisotropy of the power spectrum in the solar wind turbulence is studied by applying the wavelet technique to the magnetic field and flow velocity data
The Radial Dependence of Proton-scale Magnetic Spectral Break in Slow Solar Wind during PSP Encounter 2
• Physics
The Astrophysical Journal Supplement Series
• 2020
Magnetic field fluctuations in the solar wind are commonly observed to follow a power law spectrum. Near proton-kinetic scales, a spectral break occurs which is commonly interpreted as a transition

## References

SHOWING 1-10 OF 68 REFERENCES
Anisotropy of solar wind turbulence between ion and electron scales.
• Physics
Physical review letters
• 2010
The anisotropy of turbulence in the fast solar wind, between the ion and electron gyroscales, is directly observed using a multispacecraft analysis technique, in broad agreement with critically balanced whistler and kinetic Alfvén wave predictions.
On the origin of solar wind MHD turbulence: Helios data revisited
• Physics
• 1990
We study the fluctuations of density, magnetic and velocity fields in the frequency range from (1 day)−1 ≈ 1.2×10−5 Hz to (2.8 min)−1≈ 6×10−3 Hz, as measured by the primary Helios mission (118 days),
OBSERVATIONS OF ANISOTROPIC SCALING OF SOLAR WIND TURBULENCE
• Physics
• 2010
Using high-speed solar wind data recorded by the Ulysses spacecraft, we investigate and estimate the anisotropic inertial range scaling of the interplanetary magnetic field. We apply the method of
Radial evolution of power spectra of interplanetary Alfvénic turbulence
• Physics, Geology
• 1981
The radial evolution of the power spectra of the MHD turbulence within the trailing edge of high-speed streams in the solar wind has been investigated with the magnetic field data of HELIOS 1 and 2
Evidence of a cascade and dissipation of solar-wind turbulence at the electron gyroscale.
• Physics
Physical review letters
• 2009
The first direct determination of the dissipation range of magnetofluid turbulence in the solar wind at the electron scales is reported and a remarkable agreement with theoretical predictions of a quasi-two-dimensional cascade into Kinetic Alfvén Waves (KAW).
Detailed Fit of Critical Balance'' Theory to Solar Wind Turbulence
• Physics
• 2010
We derive the reduced spectrum of turbulent magnetic fluctuations at different frequencies f which would be observed by a single spacecraft in the solar wind when the magnetic field was at an angle
Wave-vector dependence of magnetic-turbulence spectra in the solar wind.
• Physics
Physical review letters
• 2010
From the three-dimensional energy distribution wave vector anisotropy is estimated with respect to directions parallel and perpendicular to the mean magnetic field, and the result suggests the dominance of quasi-two-dimensional turbulence toward smaller spatial scales.
MAGNETIC HELICITY SPECTRUM OF SOLAR WIND FLUCTUATIONS AS A FUNCTION OF THE ANGLE WITH RESPECT TO THE LOCAL MEAN MAGNETIC FIELD
• Physics
• 2011
Magnetic field data acquired by the Ulysses spacecraft in high-speed streams over the poles of the Sun are used to investigate the normalized magnetic helicity spectrum {sigma}{sub m} as a function
Universality of solar-wind turbulent spectrum from MHD to electron scales.
• Physics
Physical review letters
• 2009
It is shown that the electron Larmor radius plays the role of a dissipation scale in space plasma turbulence and the spectra form a quasiuniversal spectrum following the Kolmogorov's law at MHD scales.
REPRODUCTION OF THE OBSERVED TWO-COMPONENT MAGNETIC HELICITY IN SOLAR WIND TURBULENCE BY A SUPERPOSITION OF PARALLEL AND OBLIQUE ALFVEN WAVES
• Physics
• 2012
The angular distribution of the normalized reduced magnetic helicity density (sigma(r)(m)) in solar wind turbulence reveals two components of distinct polarity in different angle ranges. This kind of